脑 ⇒
电脑 diànnǎo, [電腦], computer/CL:臺|台[tái]
脑子 nǎozi, [腦子], brains/mind/CL:個|个[gè]
脑袋 nǎodài, [腦袋], head/skull/brains/mental capability/CL:顆|颗[kē],個|个[gè]
脑 nǎo, [腦], brain/mind/head/essence
大脑 dànǎo, [大腦], brain/cerebrum
头脑 tóunǎo, [頭腦], brains/mind/skull/(fig.) gist (of a matter)/leader/boss
脑海 nǎohǎi, [腦海], the mind/the brain
脑震荡 nǎozhèndàng, [腦震盪], (med.) cerebral concussion
脑筋 nǎojīn, [腦筋], brains/mind/head/way of thinking
脑浆 nǎojiāng, [腦漿], brains
首脑 shǒunǎo, [首腦], head (of state)/summit (meeting)/leader
脑瘤 nǎoliú, [腦瘤], brain tumor
后脑勺 hòunǎosháo, [後腦勺], back of the head
脑门 nǎomén, [腦門], forehead
脑细胞 nǎoxìbāo, [腦細胞], brain cell
绞尽脑汁 jiǎojìnnǎozhī, [絞盡腦汁], to rack one's brains
脑膜炎 nǎomóyán, [腦膜炎], meningitis
脑电波 nǎodiànbō, [腦電波], see 腦波|脑波[nǎo bō]
后脑 hòunǎo, [後腦], hindbrain/back of the head
脑电图 nǎodiàntú, [腦電圖], electroencephalogram (EEG)
伤脑筋 shāngnǎojīn, [傷腦筋], to be a real headache/to find sth a real headache/to beat one's brains
脑壳 nǎoké, [腦殼], skull/(fig.) brain (mental capacity)
脑力 nǎolì, [腦力], mental capacity
脑瓜 nǎoguā, [腦瓜], skull/brain/head/mind/mentality/ideas
人脑 脑炎 nǎoyán, [腦炎], brain fever/encephalitis/meningitis
动脑筋 dòngnǎojīn, [動腦筋], to use one's brains/to think
死脑筋 大脑皮层 脑外科 脑膜 nǎomó, [腦膜], meninx/meninges/membranes lining the brain
脑袋瓜 主脑 下丘脑 xiàqiūnǎo, [下丘腦], hypothalamus (anatomy)
冲昏头脑 chōnghūntóunǎo, [沖昏頭腦]/[衝昏頭腦], lit. to be muddled in the brain (idiom); fig. excited and unable to act rational...
小脑 xiǎonǎo, [小腦], cerebellum (part of the brain)
脑髓 nǎosuǐ, [腦髓], brain tissue/gray matter/brain/medulla
脑垂体 nǎochuítǐ, [腦垂體], pituitary gland
置之脑后 zhìzhīnǎohòu, [置之腦後], to banish from one's thoughts/to ignore/to take no notice
前脑 头昏脑胀 tóuhūnnǎozhàng, [頭昏腦脹], giddy/one's head spins
脑溢血 nǎoyìxuè, [腦溢血], cerebral hemorrhage/stroke
脑室 nǎoshì, [腦室], ventricles of the brain
脑满肠肥 脑血管 脑神经 nǎoshénjīng, [腦神經], cranial nerves
没头没脑 脑瘫 nǎotān, [腦癱], cerebral palsy
樟脑 zhāngnǎo, [樟腦], camphor C0H6O
脑汁 nǎozhī, [腦汁], brains
摇头晃脑 探头探脑 tàntóutànnǎo, [探頭探腦], to stick one's head out and look around (idiom)
脑积水 脑血栓 电脑房 贼头贼脑 zéitóuzéinǎo, [賊頭賊腦], lit. to behave like a thief/furtive/underhand
脑瓜子 nǎoguāzi, [腦瓜子], see 腦瓜|脑瓜[nǎo guā]
脑颅 针头线脑 zhēntóuxiànnǎo, [針頭線腦], needle and thread/sewing implements/needlework/(fig.) unimportant thing
脑门儿 脑际 nǎojì, [腦際], mind/memory
愣头愣脑 lèngtóulèngnǎo, [愣頭愣腦], rash/impetuous/reckless
老脑筋 樟脑丸 zhāngnǎowán, [樟腦丸], camphor balls/moth balls
脑力劳动 nǎolìláodòng, [腦力勞動], mental labor/intellectual work
头昏脑涨 tóuhūnnǎozhàng, [頭昏腦漲], variant of 頭昏腦脹|头昏脑胀[tóu hūn nǎo zhàng]
脑门子 nǎoménzi, [腦門子], forehead (dialect)
脑充血 nǎochōngxuè, [腦充血], stroke/cerebral hemorrhage
中脑 换脑筋 樟脑油 丘脑 qiūnǎo, [丘腦], thalamus
微电脑 wēidiànnǎo, [微電腦], microcomputer
心脑血管 一股脑儿 yīgǔnǎor, [一股腦兒], erhua variant of 一股腦|一股脑[yī gǔ nǎo]
一古脑儿 yīgǔnǎor, [一古腦兒], variant of 一股腦兒|一股脑儿[yī gǔ nǎo r]
神 ⇒
精神 jīngshén/jīngshen, spirit/mind/consciousness/thought/mental/psychological/essence/gist/CL:個|个[gè], ...
神 Shén/shén, God/abbr. for 神舟[Shén zhōu], deity/soul/spirit/unusual/mysterious/lively/express...
神父 shénfu, Christian priest or clergyman/(spiritual) father
神经 shénjīng, [神經], nerve/mental state/(coll.) unhinged/nutjob
神秘 shénmì, mysterious/mystery
神奇 shénqí, magical/mystical/miraculous
神像 shénxiàng, image of a God
眼神 yǎnshén, expression or emotion showing in one's eyes/meaningful glance/wink/eyesight (dia...
神圣 shénshèng, [神聖], divine/hallow/holy/sacred
精神病 jīngshénbìng, mental disorder/psychosis
女神 nǚshén, goddess/nymph
神经病 shénjīngbìng, [神經病], mental disorder/neuropathy/(derog.) mental case
死神 sǐshén, mythological figure (such as the Grim Reaper) in charge of taking the souls of t...
神话 shénhuà, [神話], legend/fairy tale/myth/mythology
精神病院 神经质 shénjīngzhì, [神經質], nervous/on edge/excitable/neurotic
神灵 shénlíng, [神靈], god/spirit/demon/occult or supernatural entities in general
神志 shénzhì, consciousness/state of mind/compos mentis
守护神 shǒuhùshén, [守護神], protector God/patron saint
神殿 shéndiàn, shrine
神明 shénmíng, deities/gods
神智 shénzhì, mind/wisdom/consciousness
神魂 shénhún, mind/state of mind (often abnormal)
留神 liúshén, to take care/to be careful
神仙 shénxiān, Daoist immortal/supernatural entity/(in modern fiction) fairy, elf, leprechaun e...
全神贯注 quánshénguànzhù, [全神貫注], to concentrate one's attention completely (idiom)/with rapt attention
神情 shénqíng, look/expression
神枪手 走神 zǒushén, absent-minded/one's mind is wandering
神庙 shénmiào, [神廟], temple (nonspecific)
神龙 神经科 shénjīngkē, [神經科], neurology
无神论 wúshénlùn, [無神論], atheism
提神 tíshén, to freshen up/to be cautious or vigilant/to watch out/stimulant to enhance menta...
神童 shéntóng, child prodigy
神力 shénlì, occult force/the power of a God or spirit
爱神 àishén, [愛神], god of love
神秘感 心神不宁 xīnshénbùníng, [心神不寧], to feel ill at ease
天神 tiānshén, god/deity
分神 fēnshén, to give attention to sth/please give (some of your valuable) attention to my tas...
女神像 神速 shénsù, lightning speed/amazingly rapid/incredible pace of development
战神 太阳神 tàiyángshén, [太陽神], Sun God/Apollo
神学 shénxué, [神學], theological/theology
费神 fèishén, [費神], to spend effort/to take trouble/May I trouble you to...? (as part of polite requ...
神经性 shénjīngxìng, [神經性], neural/mental/neurological
海神 hǎishén, Emperor of the Sea/Neptune
神学院 shénxuéyuàn, [神學院], seminary
神经错乱 神采奕奕 shéncǎiyìyì, in glowing spirits (idiom); bursting with life/radiating health and vigor
神经系统 shénjīngxìtǒng, [神經系統], nervous system
大力神 Dàlìshén, Heracles (Greek mythology)/Hercules (Roman mythology)
保护神 bǎohùshén, [保護神], patron saint/guardian angel
神出鬼没 shénchūguǐmò, [神出鬼沒], lit. to appear and disappear unpredictably like a spirit or a ghost (idiom)/fig....
神气 shénqì, [神氣], expression/manner/vigorous/impressive/lofty/pretentious
中枢神经 神户 Shénhù, [神戶], Kōbe, major Japanese port near Ōsaka
神经细胞 shénjīngxìbāo, [神經細胞], nerve cell/neuron
神清气爽 shénqīngqìshuǎng, [神清氣爽], (idiom) full of vitality/relaxed and alert
有神 神经元 shénjīngyuán, [神經元], neuron
精神焕发 jīngshénhuànfā, [精神煥發], in high spirits (idiom); glowing with health and vigor
神功 shéngōng, amazing powers/miraculous skill
心神 xīnshén, mind/state of mind/attention/(Chinese medicine) psychic constitution
神通广大 shéntōngguǎngdà, [神通廣大], to possess great magical power/to possess remarkable abilities
神灯 神态 shéntài, [神態], appearance/manner/bearing/deportment/look/expression/mien
心醉神迷 xīnzuìshénmí, ecstatic/enraptured
神色 shénsè, expression/look
传神 chuánshén, [傳神], vivid/lifelike
神经痛 shénjīngtòng, [神經痛], neuralgia (medicine)
出神入化 chūshénrùhuà, to reach perfection (idiom); a superb artistic achievement
神秘兮兮 神甫 shénfu, variant of 神父[shén fu]
神经中枢 瘟神 wēnshén, demon personifying pestilence
心神不定 失神 shīshén, absent-minded/to lose spirit/despondent
神鹰 凶神恶煞 xiōngshénèshà, [兇神惡煞], fiends (idiom); devils and monsters
门神 ménshén, [門神], door god
鬼神 guǐshén, supernatural beings
坐骨神经 zuògǔshénjīng, [坐骨神經], sciatic nerve
神威 神韵 shényùn, [神韻], charm or grace (in poetry or art)
聚精会神 jùjīnghuìshén, [聚精會神], to concentrate one's attention (idiom)
视神经 shìshénjīng, [視神經], optic nerve
入神 rùshén, to be enthralled/to be entranced
伤神 神经衰弱 shénjīngshuāiruò, [神經衰弱], (euphemism) mental illness/psychasthenia
养神 yǎngshén, [養神], to rest/to recuperate/to regain composure
定神 dìngshén, to compose oneself/to concentrate one's attention
神田 神勇 神化 shénhuà, to make divine/apotheosis
装神弄鬼 zhuāngshénnòngguǐ, [裝神弄鬼], lit. dress up as God, play the devil (idiom); fig. to mystify/to deceive people/...
出神 chūshén, spellbound/entranced/lost in thought
神宫儿 脑神经 nǎoshénjīng, [腦神經], cranial nerves
炯炯有神 jiǒngjiǒngyǒushén, eyes bright and full of expression
运动神经 神来之笔 心旷神怡 xīnkuàngshényí, [心曠神怡], lit. heart untroubled, spirit pleased (idiom); carefree and relaxed
神崎 财神 cáishén, [財神], god of wealth
神投手 神物 交感神经 jiāogǎnshénjīng, [交感神經], sympathetic nervous system
鬼斧神工 guǐfǔshéngōng, supernaturally fine craft (idiom); the work of the Gods/uncanny workmanship/supe...
神采飞扬 shéncǎifēiyáng, [神采飛揚], in high spirits (idiom); glowing with health and vigor
神气活现 shénqìhuóxiàn, [神氣活現], arrogant appearance/smug appearance/to act condescending/to put on airs
惊天地泣鬼神 神剑 令人神往 心领神会 xīnlǐngshénhuì, [心領神會], to understand tacitly (idiom)/to know intuitively/to understand thoroughly
精神性 jīngshénxìng, spirituality/mental/nervous/psychogenic
神权 shénquán, [神權], divine right (of kings)
神医 神通 shéntōng, remarkable ability/magical power
神龛 shénkān, [神龕], shrine/niche/household shrine
神道 Shéndào, Shinto (Japanese religion)
神人 shénrén, God/deity
面神经 神君 神往 shénwǎng, to be fascinated/to be rapt/to long for/to dream of
神佑 神崎二 精神损失费 凝神 níngshén, with rapt attention
黯然神伤 神汉 shénhàn, [神漢], sorcerer
神坛 拜神 精神抖擞 jīngshéndǒusǒu, [精神抖擻], spirit trembling with excitement (idiom); in high spirits/lively and full of ent...
心驰神往 xīnchíshénwǎng, [心馳神往], one's thoughts fly to a longed-for place or person/to long for/infatuated/fascin...
财神爷 cáishényé, [財神爺], god of wealth/very wealthy man
神曲 Shénqǔ/shénqū, The Divine Comedy by Dante Alighieri 但丁, medicated leaven (used in TCM to treat ...
神妙 shénmiào, marvelous/wondrous
神似 shénsì, similar in expression and spirit/to bear a remarkable resemblance to
神采 shéncǎi, expression/spirit/vigor
安神 ānshén, to calm (soothe) the nerves/to relieve uneasiness of body and mind
神怪 shénguài, spirits and devils (usually harmful)/demon
神女 Shénnǚ/shénnǚ, The Goddess, 1934 silent film about a Shanghai prostitute, directed by 吳永剛|吴永刚[W...
神交 shénjiāo, soul brothers/friends in spirit who have never met/to commune with
河神 héshén, river god
愣神 神学家 shénxuéjiā, [神學家], theologian
貌合神离 màohéshénlí, [貌合神離], the appearance of unity, but divided at heart (idiom); seeming harmony belies un...
神山 shénshān, sacred mountain
各显神通 听神经 神效 鬼使神差 guǐshǐshénchāi, demons and gods at work (idiom); unexplained event crying out for a supernatural...
神乎其神 神台 抖擞精神 dǒusǒujīngshén, [抖擻精神], to gather one's spirits/to pull oneself together
感觉神经 慌神 huāngshén, to get agitated/to panic
牛鬼蛇神 niúguǐshéshén, evil monsters/(fig.) bad characters/(political) bad elements
副神经 谷神星 Gǔshénxīng, [穀神星], Ceres, dwarf planet in the asteroid belt between Mars and Jupiter, discovered in...
一神教 yīshénjiào, monotheistic religion/monotheism
神泉流 神佛发 奉若神明 fèngruòshénmíng, to honor sb as a God (idiom); to revere/to worship/to deify/to make a holy cow o...
神经炎 风神 神恩 神兆 神府 末梢神经 mòshāoshénjīng, [末梢神經], peripheral nerve
神位 shénwèi, spirit tablet/ancestral tablet
神佑之 心神不安 xīnshénbùān, to feel ill at ease
神态自若 神子会 神经原 shénjīngyuán, [神經原], neuron/also written 神經元|神经元
神山清 月亮神 有神论 yǒushénlùn, [有神論], theism (the belief in the existence of God)
神山贤
经 ⇒
已经 yǐjīng, [已經], already
曾经 céngjīng, [曾經], once/already/former/previously/ever/(past tense marker used before verb or claus...
经历 jīnglì, [經歷], experience/CL:個|个[gè],次[cì]/to experience/to go through
经常 jīngcháng, [經常], frequently/constantly/regularly/often/day-to-day/everyday/daily
经过 jīngguò, [經過], to pass/to go through/process/course/CL:個|个[gè]
经理 jīnglǐ, [經理], manager/director/CL:個|个[gè],位[wèi],名[míng]
经验 jīngyàn, [經驗], experience/to experience
神经 shénjīng, [神經], nerve/mental state/(coll.) unhinged/nutjob
经 Jīng/jīng, [經], surname Jing, classics/sacred book/scripture/to pass through/to undergo/to bear/...
经济 jīngjì, [經濟], economy/economic
经纪人 jīngjìrén, [經紀人], broker/middleman/agent/manager
圣经 Shèngjīng, [聖經], Holy Bible/the Confucian classics/CL:本[běn],部[bù]
经典 jīngdiǎn, [經典], the classics/scriptures/classical/classic (example, case etc)/typical
经营 jīngyíng, [經營], to engage in (business etc)/to run/to operate
神经病 shénjīngbìng, [神經病], mental disorder/neuropathy/(derog.) mental case
正经 zhèngjīng, [正經], decent/honorable/proper/serious/according to standards
经受 jīngshòu, [經受], to undergo (hardship)/to endure/to withstand
经纪 jīngjì, [經紀], to manage (a business)/manager/broker
未经 wèijīng, [未經], not having undergone/without (having gone though a certain process)
神经质 shénjīngzhì, [神經質], nervous/on edge/excitable/neurotic
月经 yuèjīng, [月經], menstruation/a woman's period
经费 jīngfèi, [經費], funds/expenditure/CL:筆|笔[bǐ]
正经事 不经意 bùjīngyì, [不經意], not paying attention/carelessly/by accident
总经理 zǒngjīnglǐ, [總經理], general manager/CEO
经手 jīngshǒu, [經手], to pass through one's hands/to handle/to deal with
神经科 shénjīngkē, [神經科], neurology
历经 lìjīng, [歷經], to experience/to go through
经济学 jīngjìxué, [經濟學], economics (as a field of study)
经销商 jīngxiāoshāng, [經銷商], dealer/seller/distributor/broker/agency/franchise (i.e. company)/retail outlet
经济舱 jīngjìcāng, [經濟艙], economy class
必经 bìjīng, [必經], unavoidable/the only (road, entrance etc)
途经 tújīng, [途經], to pass through/via/by way of
经由 jīngyóu, [經由], via
神经性 shénjīngxìng, [神經性], neural/mental/neurological
经不起 jīngbuqǐ, [經不起], can't stand it/to be unable to bear/to be unable to resist
一本正经 yīběnzhèngjīng, [一本正經], in deadly earnest/deadpan
神经错乱 经文 jīngwén, [經文], scripture/scriptures/CL:本[běn]
神经系统 shénjīngxìtǒng, [神經系統], nervous system
可兰经 Kělánjīng, [可蘭經], Quran (Islamic scripture)
中枢神经 经商 jīngshāng, [經商], to trade/to carry out commercial activities/in business
财经 cáijīng, [財經], finance and economics
神经细胞 shénjīngxìbāo, [神經細胞], nerve cell/neuron
经度 jīngdù, [經度], longitude
神经元 shénjīngyuán, [神經元], neuron
经得起 jīngdeqǐ, [經得起], to be able to withstand/to be able to endure
离经叛道 líjīngpàndào, [離經叛道], to rebel against orthodoxy/to depart from established practices
流经 绝经期 正经人 东经 dōngjīng, [東經], longitude east
漫不经心 mànbùjīngxīn, [漫不經心], careless/heedless/absent-minded/indifferent
一经 痛经 tòngjīng, [痛經], menstrual pain/dysmenorrhea
经传 jīngzhuàn, [經傳], classic work (esp. Confucian classics)
神经痛 shénjīngtòng, [神經痛], neuralgia (medicine)
经营者 jīngyíngzhě, [經營者], executive/manager/transactor
神经中枢 天经地义 tiānjīngdìyì, [天經地義], lit. heaven's law and earth's principle (idiom); fig. right and proper/right and...
经济学家 jīngjìxuéjiā, [經濟學家], economist
西经 xījīng, [西經], longitude west
名不见经传 míngbùjiànjīngzhuàn, [名不見經傳], (lit.) name not encountered in the classics/unknown (person)/nobody
苦心经营 kǔxīnjīngyíng, [苦心經營], to build up an enterprise through painstaking efforts
经济危机 jīngjìwēijī, [經濟危機], economic crisis
经典之作 经常性 念经 niànjīng, [念經], to recite or chant Buddhist scripture
坐骨神经 zuògǔshénjīng, [坐骨神經], sciatic nerve
取经 qǔjīng, [取經], to journey to India on a quest for the Buddhist scriptures/to learn by studying ...
正儿八经 zhèngérbājīng, [正兒八經], serious/earnest/real/true
经纬度 视神经 shìshénjīng, [視神經], optic nerve
神经衰弱 shénjīngshuāiruò, [神經衰弱], (euphemism) mental illness/psychasthenia
引经据典 yǐnjīngjùdiǎn, [引經據典], lit. to quote the classics/to quote chapter and verse (idiom)
身经百战 shēnjīngbǎizhàn, [身經百戰], lit. veteran of a hundred battles (idiom)/fig. experienced/seasoned
脑神经 nǎoshénjīng, [腦神經], cranial nerves
运动神经 经久不衰 jīngjiǔbùshuāi, [經久不衰], unfailing/never-ending
经销 jīngxiāo, [經銷], to sell/to sell on commission/to distribute
久经沙场 生意经 shēngyijīng, [生意經], knack of doing business/business sense
古兰经 Gǔlánjīng, [古蘭經], Koran (Islamic scripture)/Quran
佛经 Fójīng, [佛經], Buddhist texts/scripture
交感神经 jiāogǎnshénjīng, [交感神經], sympathetic nervous system
经营权 经得住 真经 zhēnjīng, [真經], sutra/Taoist treatise
经不住 jīngbuzhù, [經不住], to be unable to bear
经脉 jīngmài, [經脈], channel of TCM
市场经济 shìchǎngjīngjì, [市場經濟], market economy
荒诞不经 huāngdànbùjīng, [荒誕不經], absurd/preposterous/ridiculous
易经 Yìjīng, [易經], The Book of Changes ("I Ching")
面神经 经办 行经 xíngjīng, [行經], to pass by/menstruation
久经考验 jiǔjīngkǎoyàn, [久經考驗], well tested (idiom); seasoned/veteran
经手人 jīngshǒurén, [經手人], the person in charge/agent/broker
经验主义 jīngyànzhǔyì, [經驗主義], empiricism
经济性 诵经 sòngjīng, [誦經], to chant the sutras
路经 罗经 luójīng, [羅經], compass/same as 羅盤|罗盘
经血 jīngxuè, [經血], menstruation (TCM)
经济体 经济效益 曾经沧海 céngjīngcānghǎi, [曾經滄海], lit. having crossed the vast ocean (idiom)/fig. widely experienced in the viciss...
经络 jīngluò, [經絡], energy channels/meridian (TCM)/(dialect) trick/tactic
经书 jīngshū, [經書], classic books in Confucianism/scriptures/sutras
饱经 金刚经 正经八百 zhèngjīngbābǎi, [正經八百], very serious/solemn
历经沧桑 经久不息 经济区 经济作物 jīngjìzuòwù, [經濟作物], cash crop (economics)
经销权 听神经 饱经风霜 bǎojīngfēngshuāng, [飽經風霜], weather-beaten/having experienced the hardships of life
经意 经纬 jīngwěi, [經緯], warp and woof/longitude and latitude/main points
小本经营 惨淡经营 cǎndànjīngyíng, [慘淡經營], to manage by painstaking effort (idiom)
感觉神经 月经带 经济特区 jīngjìtèqū, [經濟特區], special economic zone
经营不善 副神经 经济部 经济界 jīngjìjiè, [經濟界], economic circles
四书五经 经销处 经贸 jīngmào, [經貿], trade
正经话 狗经常 神经炎 经纬线 jīngwěixiàn, [經緯線], lines of latitude and longitude/warp and woof
经援 经管 jīngguǎn, [經管], to be in charge of
经线 jīngxiàn, [經線], warp/line of longitude/meridian (geography)
经久 jīngjiǔ, [經久], long-lasting/durable
计划经济 jìhuàjīngjì, [計劃經濟], planned economy
经售 饱经沧桑 bǎojīngcāngsāng, [飽經滄桑], having lived through many changes
末梢神经 mòshāoshénjīng, [末梢神經], peripheral nerve
山海经 ShānhǎiJīng, [山海經], Classic of Mountain and Sea, probably compiled c. 500 BC-200 BC, contains wide r...
自主经营 经济基础 jīngjìjīchǔ, [經濟基礎], socio-economic base/economic foundation
六经 Liùjīng, [六經], Six Classics, namely: Book of Songs 詩經|诗经[Shī jīng], Book of History 尚書|尚书[Shàng...
神经原 shénjīngyuán, [神經原], neuron/also written 神經元|神经元
国民经济 guómínjīngjì, [國民經濟], national economy
经年累月 jīngniánlěiyuè, [經年累月], for years/over the years
日经 rìjīng, [日經], Nikkei, abbr. for Nikkei Shimbun 日本經濟新聞|日本经济新闻[Rì běn Jīng jì Xīn wén]/abbr. for...
几经周折