运 ⇒
幸运 xìngyùn, [幸運], fortunate/lucky/fortune/luck
好运 hǎoyùn, [好運], good luck
运动 yùndòng, [運動], to move/to exercise/sports/exercise/motion/movement/campaign/CL:場|场[chǎng]
命运 mìngyùn, [命運], fate/destiny/CL:個|个[gè]
运气 yùnqi, [運氣], luck (good or bad)
运 yùn, [運], to move/to transport/to use/to apply/fortune/luck/fate
走运 zǒuyùn, [走運], to have good luck/lucky/in luck
运动员 yùndòngyuán, [運動員], athlete/CL:名[míng],個|个[gè]
运作 yùnzuò, [運作], to operate/operations/workings/activities (usu. of an organization)/thread (comp...
运用 yùnyòng, [運用], to use/to put to use
运行 yùnxíng, [運行], to move along one's course (of celestial bodies etc)/(fig.) to function/to be in...
运输 yùnshū, [運輸], to transport/to carry/transportation
运转 yùnzhuǎn, [運轉], to work/to operate/to revolve/to turn around
运送 yùnsòng, [運送], to transport/to carry
奥运会 Àoyùnhuì, [奧運會], abbr. for 奧林匹克運動會|奥林匹克运动会/Olympic Games/the Olympics
运动鞋 yùndòngxié, [運動鞋], sports shoes/sneakers
厄运 èyùn, [厄運], bad luck/misfortune/adversity
运动衫 yùndòngshān, [運動衫], sports shirt/sweatshirt/CL:件[jiàn]
运河 yùnhé, [運河], canal
货运 huòyùn, [貨運], freight transport/cargo/transported goods
运营 yùnyíng, [運營], to be in operation/to do business/(of train, bus etc) to be in service/operation...
运动场 yùndòngchǎng, [運動場], sports field/playground/exercise yard
幸运儿 xìngyùnér, [幸運兒], winner/lucky guy/person who always gets good breaks
奥运 Àoyùn, [奧運], abbr. for 奧林匹克運動會|奥林匹克运动会/Olympic Games/the Olympics
运钞车 yùnchāochē, [運鈔車], armored car (for transporting valuables)
搬运 bānyùn, [搬運], freight/transport/portage/to transport/to carry
偷运 tōuyùn, [偷運], to smuggle
转运 zhuǎnyùn, [轉運], to forward goods/to ship/to distribute/transshipment/a lucky break/change of for...
运算 yùnsuàn, [運算], to perform calculations/(mathematical) operation
空运 kōngyùn, [空運], air transport
运动服 yùndòngfú, [運動服], sportswear
运动会 yùndònghuì, [運動會], sports competition/CL:個|个[gè]
运球 yùnqiú, [運球], to dribble (basketball, soccer etc)
搬运工 bānyùngōng, [搬運工], porter
运往 运输机 体育运动 tǐyùyùndòng, [體育運動], sports/physical culture
船运 chuányùn, [船運], sea freight/shipping
装运 zhuāngyùn, [裝運], to ship/shipment
运输车 时来运转 shíláiyùnzhuǎn, [時來運轉], the time comes, fortune turns (idiom); to have a lucky break/things change for t...
托运 tuōyùn, [托運], to consign (goods)/to check through (baggage)
航运 hángyùn, [航運], shipping/transport
押运 yāyùn, [押運], to escort (goods or funds)/to convey under guard
桃花运 táohuāyùn, [桃花運], luck with the ladies/a romance/good luck
时运 shíyùn, [時運], circumstances/fate
运通 运动队 禁运 jìnyùn, [禁運], embargo/export ban (e.g. on weapons)
背运 bèiyùn, [背運], bad luck/unlucky
运输队 运动健将 海运 hǎiyùn, [海運], shipping by sea
营运 yíngyùn, [營運], running/operation (of airport, bus service, business etc)
噩运 èyùn, [噩運], variant of 厄運|厄运[è yùn]
运费 yùnfèi, [運費], freight fee
运动衣 运动神经 鸿运 hóngyùn, [鴻運], variant of 紅運|红运[hóng yùn]
恶运 èyùn, [惡運], variant of 厄運|厄运[è yùn]
财运 幸运者 应运而生 yìngyùnérshēng, [應運而生], to emerge to meet a historic destiny (idiom)/to arise at an opportune time/able ...
运输船 yùnshūchuán, [運輸船], transport ship
客运 kèyùn, [客運], passenger transportation/(Tw) intercity bus
运动量 亚运会 Yàyùnhuì, [亞運會], Asian Games
联运 liányùn, [聯運], through transport/through traffic jointly organized by different enterprises
运输业 yùnshūyè, [運輸業], transportation industry
运载 yùnzài, [運載], to carry/to convey/delivery/supply
运筹帷幄 yùnchóuwéiwò, [運籌帷幄], lit. to devise battle plan in a tent (idiom)/fig. planning strategies
启蒙运动 水运 shuǐyùn, [水運], waterborne transport
运动病 yùndòngbìng, [運動病], car sickness/motion sickness
运力 客运站 国运 guóyùn, [國運], fate of the nation
田径运动 tiánjìngyùndòng, [田徑運動], track and field sports
载运 zàiyùn, [載運], to convey (on vehicle)/to freight
货运单 武运常 大运河 DàYùnhé, [大運河], the Grand Canal, 1800 km from Beijing to Hangzhou, built starting from 486 BC
运价 yùnjià, [運價], fare/transport cost
同呼吸共命运 运程 yùnchéng, [運程], one's fortune (in astrology)
运输量 yùnshūliàng, [運輸量], volume of freight
运输线 周运程 贩运 fànyùn, [販運], to transport (for sale)/to traffic (in sth)
承运 chéngyùn, [承運], to provide transport/to accept the Mandate of Heaven/to acknowledge one's callin...
货运站 金美运 春运 chūnyùn, [春運], (increased) passenger transportation around Chinese New Year
陆运 lùyùn, [陸運], land transport
发运 fāyùn, [發運], (of goods) to dispatch/shipment/shipping
货运费 运筹 yùnchóu, [運籌], to plan/operations/logistics
运管 运输费 运输舰 yùnshūjiàn, [運輸艦], transport ship
货运量 运冰 新运星 群众运动 车运来 调运 快运 校运会 清运 倒运 dǎoyùn, [倒運], to have bad luck
运行图 接运 运河区 YùnhéQū, [運河區], Yunhe District of Cangzhou City 滄州市|沧州市[Cāng zhōu Shì], Hebei
运动学 yùndòngxué, [運動學], kinematics
交通运输业 车来运 何运东 起运 qǐyùn, [起運], variant of 啟運|启运[qǐ yùn]
机 ⇒
机会 jīhuì, [機會], opportunity/chance/occasion/CL:個|个[gè]
飞机 fēijī, [飛機], airplane/CL:架[jià]
手机 shǒujī, [手機], cell phone/mobile phone/CL:部[bù],支[zhī]
机 Jī/jī, [機], surname Ji, machine/engine/opportunity/intention/aircraft/pivot/crucial point/fl...
机器 jīqì, [機器], machine/CL:臺|台[tái],部[bù],個|个[gè]
机场 jīchǎng, [機場], airport/airfield/CL:家[jiā],處|处[chù]
司机 sījī, [司機], chauffeur/driver/CL:個|个[gè]
机器人 jīqìrén, [機器人], mechanical person/robot/android
机构 jīgòu, [機構], mechanism/structure/organization/agency/institution/CL:所[suǒ]
动机 dòngjī, [動機], motor/locomotive/motive/motivation/intention
时机 shíjī, [時機], fortunate timing/occasion/opportunity
直升机 zhíshēngjī, [直升機], helicopter/CL:架[jià]
机密 jīmì, [機密], secret/classified (information)
危机 wēijī, [危機], crisis/CL:個|个[gè]
摄像机 shèxiàngjī, [攝像機], video camera/CL:部[bù]
相机 xiàngjī, [相機], camera (abbr. for 照相機|照相机[zhào xiàng jī])/at the opportune moment/as the circums...
机票 jīpiào, [機票], air ticket/passenger ticket/CL:張|张[zhāng]
收音机 shōuyīnjī, [收音機], radio/CL:臺|台[tái]
计算机 jìsuànjī, [計算機], computer/(Tw) calculator/CL:臺|台[tái]
机械 jīxiè, [機械], machine/machinery/mechanical/(old) cunning/scheming
扳机 bānjī, [扳機], (gun) trigger
电视机 diànshìjī, [電視機], television set/CL:臺|台[tái]
随机 suíjī, [隨機], according to the situation/pragmatic/random
摄影机 shèyǐngjī, [攝影機], camera/movie camera
登机 dēngjī, [登機], to board a plane
照相机 zhàoxiàngjī, [照相機], camera/CL:個|个[gè],架[jià],部[bù],台[tái],隻|只[zhī]
机关 jīguān, [機關], mechanism/gear/machine-operated/office/agency/organ/organization/establishment/i...
发动机 fādòngjī, [發動機], engine/motor/CL:臺|台[tái]
战机 zhànjī, [戰機], opportunity in a battle/fighter aircraft/war secret
机长 jīzhǎng, [機長], captain/chief pilot
机上 发电机 fādiànjī, [發電機], electricity generator/dynamo
耳机 ěrjī, [耳機], headphones/earphones/telephone receiver
关机 guānjī, [關機], to turn off (a machine or device)/to finish shooting a film
打火机 dǎhuǒjī, [打火機], lighter/cigarette lighter
直升飞机 zhíshēngfēijī, [直升飛機], see 直升機|直升机[zhí shēng jī]
对讲机 duìjiǎngjī, [對講機], intercom/walkie-talkie
有机 yǒujī, [有機], organic
班机 bānjī, [班機], airliner/(regular) flight/CL:趟[tàng],次[cì],班[bān]
机遇 jīyù, [機遇], opportunity/favorable circumstance/stroke of luck
坠机 zhuìjī, [墜機], airplane crash
战斗机 zhàndòujī, [戰鬥機], fighter (aircraft)
机灵 jīling, [機靈], clever/quick-witted
主机 zhǔjī, [主機], main engine/(military) lead aircraft/(computing) host computer/main processor/se...
洗衣机 xǐyījī, [洗衣機], washer/washing machine/CL:臺|台[tái]
穿梭机 转机 zhuǎnjī, [轉機], (to take) a turn for the better/to change planes
录音机 lùyīnjī, [錄音機], (tape) recording machine/tape recorder/CL:臺|台[tái]
游戏机 yóuxìjī, [遊戲機], video game/game machine
机枪 jīqiāng, [機槍], machine gun
粉碎机 fěnsuìjī, [粉碎機], pulverizer/grinder
机动 jīdòng, [機動], locomotive/motorized/power-driven/adaptable/flexible (use, treatment, timing etc...
机制 jīzhì, [機制]/[機製], mechanism, machine processed/machine made/mechanism
录像机 lùxiàngjī, [錄像機], video recorder/VCR
机智 jīzhì, [機智], quick-witted/resourceful
起重机 qǐzhòngjī, [起重機], crane
趁机 chènjī, [趁機], to seize an opportunity/to take advantage of situation
飞机场 fēijīchǎng, [飛機場], airport/(slang) flat chest/CL:處|处[chù]
开机 kāijī, [開機], to start an engine/to boot up (a computer)/to press Ctrl-Alt-Delete/to begin sho...
机车 jīchē, [機車], locomotive/train engine car/scooter (Tw)/(slang) (Tw) hard to get along with/a p...
拖拉机 tuōlājī, [拖拉機], tractor/CL:臺|台[tái]
劫机 jiéjī, [劫機], hijacking/air piracy
提款机 tíkuǎnjī, [提款機], bank autoteller/ATM
轰炸机 hōngzhàjī, [轟炸機], bomber (aircraft)
敌机 díjī, [敵機], enemy plane
停机 tíngjī, [停機], (of a machine) to stop/to shut down/to park a plane/to finish shooting (a TV pro...
生机 shēngjī, [生機], opportunity to live/to reprieve from death/life force/vitality
复印机 fùyìnjī, [複印機], photocopier
洗碗机 xǐwǎnjī, [洗碗機], dishwasher
机油 jīyóu, [機油], engine oil
机能 jīnéng, [機能], function
机关枪 jīguānqiāng, [機關槍], also written 機槍|机枪/machine gun
机组 jīzǔ, [機組], flight crew (on a plane)/unit (apparatus)
喷气机 pēnqìjī, [噴氣機], jet plane
打字机 dǎzìjī, [打字機], typewriter
打印机 dǎyìnjī, [打印機], printer
唱机 chàngjī, [唱機], gramophone
机舱 jīcāng, [機艙], cabin of a plane
机灵鬼 jīlíngguǐ, [機靈鬼], (jocularly) clever and quick-witted person
割草机 gēcǎojī, [割草機], lawn mower (machine)
客机 kèjī, [客機], passenger plane
推土机 tuītǔjī, [推土機], bulldozer
停机坪 tíngjīpíng, [停機坪], aircraft parking ground/apron/tarmac (at airport)
售货机 传真机 chuánzhēnjī, [傳真機], fax machine
收银机 shōuyínjī, [收銀機], cash register/check out counter
飞机票 fēijīpiào, [飛機票], air ticket/CL:張|张[zhāng]
良机 liángjī, [良機], a good chance/a golden opportunity
吹风机 chuīfēngjī, [吹風機], hair dryer
投机 tóujī, [投機], to speculate (on financial markets)/opportunistic/congenial/agreeable
借机 jièjī, [借機], to seize the opportunity
座机 zuòjī, [座機], fixed phone/private plane
升降机 shēngjiàngjī, [升降機], aerial work platform (e.g. cherry picker or scissor lift)/lift/elevator
机翼 jīyì, [機翼], wing (of an aircraft)
候机 分机 fēnjī, [分機], (telephone) extension/CL:臺|台[tái]
订书机 dìngshūjī, [訂書機], stapler/stapling machine/bookbinding machine/CL:臺|台[tái]
机位 机队 搅拌机 jiǎobànjī, [攪拌機], blender/food mixer
伺机 sìjī, [伺機], to wait for an opportunity/to watch for one's chance
机械师 jīxièshī, [機械師], mechanic/engineer/machinist/machine operator/CL:個|个[gè],位[wèi]
机身 jīshēn, [機身], body of a vehicle or machine/fuselage of a plane
机体 jītǐ, [機體], organism (biology)/airframe (aeronautics)
机师 总机 zǒngjī, [總機], central exchange/telephone exchange/switchboard
老虎机 lǎohǔjī, [老虎機], slot machine
借此机会 机不可失 jībùkěshī, [機不可失], No time to lose! (idiom)
运输机 随机应变 suíjīyìngbiàn, [隨機應變], to change according to the situation (idiom); pragmatic
登机口 dēngjīkǒu, [登機口], departure gate (aviation)
机修 机械人 机械化 jīxièhuà, [機械化], to mechanize
放映机 专机 传呼机 chuánhūjī, [傳呼機], pager/beeper
机库 jīkù, [機庫], (aircraft) hangar
先机 xiānjī, [先機], key moment/decisive opportunity
航天飞机 hángtiānfēijī, [航天飛機], space shuttle
登机牌 dēngjīpái, [登機牌], boarding pass
上机 费尽心机 fèijìnxīnjī, [費盡心機], to rack one's brains for schemes (idiom)/to beat one's brains out
机子 jīzi, [機子], machine/device
侦察机 zhēnchájī, [偵察機], surveillance aircraft/spy plane
有机体 yǒujītǐ, [有機體], organism
机敏 jīmǐn, [機敏], agility
原型机 机警 jījǐng, [機警], perceptive/astute/sharp/sharp-witted/vigilant/alert
契机 qìjī, [契機], opportunity/turning point/juncture
危机四伏 wēijīsìfú, [危機四伏], danger lurks on every side (idiom)
天机 tiānjī, [天機], mystery known only to heaven (archaic)/inscrutable twist of fate/fig. top secret
电话机 diànhuàjī, [電話機], telephone set
有机物 yǒujīwù, [有機物], organic substance/organic matter
滑翔机 huáxiángjī, [滑翔機], glider
玄机 xuánjī, [玄機], profound theory (in Daoism and Buddhism)/mysterious principles
劫机犯 步话机 bùhuàjī, [步話機], walkie-talkie
包机 bāojī, [包機], chartered plane/to charter a plane
生机勃勃 shēngjībóbó, [生機勃勃], full of vitality
天赐良机 一线生机 一号机 电机 diànjī, [電機], electrical machinery
机头 jītóu, [機頭], the front (nose) of a plane etc
错失良机 收割机 下机 缝纫机 féngrènjī, [縫紉機], sewing machine/CL:架[jià]
机房 jīfáng, [機房], machine room/engine room/computer room
有机可乘 yǒujīkěchéng, [有機可乘], to have an opportunity that one can exploit (idiom)
投机取巧 tóujīqǔqiǎo, [投機取巧], to seize every opportunity/to be full of tricks
乘机 chéngjī, [乘機], to take the opportunity/to take a plane
压缩机 yāsuōjī, [壓縮機], compactor/compressor
僚机 心机 xīnjī, [心機], thinking/scheme
机缘 jīyuán, [機緣], chance/opportunity/destiny
钉书机 dìngshūjī, [釘書機], stapler
长机 zhǎngjī, [長機], (military) lead aircraft
机会主义 jīhuìzhǔyì, [機會主義], opportunism/pragmatism
候机室 收款机 切割机 机时 机要 灵机一动 língjīyīdòng, [靈機一動], a bright idea suddenly occurs (idiom); to hit upon an inspiration/to be struck b...
轮机长 榨汁机 zhàzhījī, [榨汁機], juicer/blender
杀机 shājī, [殺機], desire to commit murder/great danger
机动车 jīdòngchē, [機動車], motor vehicle
电唱机 diànchàngjī, [電唱機], gramophone/record player
联机 liánjī, [聯機], online/network/to connect online/to connect an electronic device to another devi...
除草机 留声机 liúshēngjī, [留聲機], gramophone/phonograph
机型 投机者 tóujīzhě, [投機者], speculator
印刷机 yìnshuājī, [印刷機], printing press
重机枪 zhòngjīqiāng, [重機槍], heavy machine gun
危机感 发射机 fāshèjī, [發射機], transmitter
打孔机 投机商 机件 jījiàn, [機件], component (mechanics)
经济危机 jīngjìwēijī, [經濟危機], economic crisis
鼓风机 gǔfēngjī, [鼓風機], bellows/ventilator/air blower
处理机 飞机库 织机 zhījī, [織機], loom
待机 dàijī, [待機], to wait for an opportunity/(electronic devices) standby
轮机 lúnjī, [輪機], turbine
寻呼机 xúnhūjī, [尋呼機], pager/beeper
商机 shāngjī, [商機], business opportunity/commercial opportunity
当机立断 dāngjīlìduàn, [當機立斷], to make prompt decisions (idiom)
货机 huòjī, [貨機], cargo plane
机理 jīlǐ, [機理], mechanism
晕机 yùnjī, [暈機], to become airsick
打浆机 织布机 zhībùjī, [織布機], loom
无人机 wúrénjī, [無人機], drone/unmanned aerial vehicle
驾机 交换机 jiāohuànjī, [交換機], switch (telecommunications)
攻击机 gōngjījī, [攻擊機], ground attack aircraft
有机化学 yǒujīhuàxué, [有機化學], organic chemistry
发报机 水上飞机 shuǐshàngfēijī, [水上飛機], seaplane
奥机 赌博机 话不投机 huàbùtóujī, [話不投機], the conversation is disagreeable (idiom)
电动机 diàndòngjī, [電動機], electric motor
冰机 剪草机 jiǎncǎojī, [剪草機], lawnmower
国家机器 可乘之机 果汁机 guǒzhījī, [果汁機], blender (device)/juicer
放影机 军机 jūnjī, [軍機], military aircraft/secret plan/Privy Council during the Qing dynasty
风机 fēngjī, [風機], fan/ventilator
电子游戏机 收录机 shōulùjī, [收錄機], radio-tape recorder
话机 随机性 suíjīxìng, [隨機性], randomness/stochasticity
挖掘机 wājuéjī, [挖掘機], excavator
铲雪机 机动性 jīdòngxìng, [機動性], flexibility
离心机 líxīnjī, [離心機], centrifuge
样机 yàngjī, [樣機], prototype
绞肉机 jiǎoròujī, [絞肉機], meat grinder
机群 财政危机 录放机 抛光机 日理万机 主机房 无机 wújī, [無機], inorganic (chemistry)
内燃机 nèiránjī, [內燃機], internal combustion engine
空调机 蒸汽机 zhēngqìjī, [蒸汽機], steam engine
对撞机 duìzhuàngjī, [對撞機], a particle collider
农机 nóngjī, [農機], agricultural machinery
打桩机 dǎzhuāngjī, [打樁機], pile driver (machinery)
抽水机 chōushuǐjī, [抽水機], water pump
透析机 tòuxījī, [透析機], dialysis machine
装订机 扩音机 kuòyīnjī, [擴音機], amplifier/loudspeaker/hearing aid
人机 二号机 无机物 wújīwù, [無機物], inorganic compound
油机 傻瓜相机 shǎguāxiàngjī, [傻瓜相機], point-and-shoot camera/compact camera
机电 jīdiàn, [機電], machinery and power-generating equipment/electromechanical
售票机 验钞机 yànchāojī, [驗鈔機], a device used to check money and detect counterfeit bills
机芯 机载 东条英机 DōngtiáoYīngjī, [東條英機], Tojo Hideki (1884-1948), Japanese military leader hanged as war criminal in 1948
压路机 yālùjī, [壓路機], road roller
勃勃生机 幻灯机 huàndēngjī, [幻燈機], slide projector/overhead projector
有机肥料 候机楼 hòujīlóu, [候機樓], airport terminal
国家机关 录相机 机械手 涡轮机 影碟机 yǐngdiéjī, [影碟機], DVD player
穿孔机 友机 液压机 柴油机 cháiyóujī, [柴油機], diesel engine
微机 wēijī, [微機], micro (computer)
生机蓬勃 破碎机 洒水机 sǎshuǐjī, [灑水機], sprinkler
电报机 diànbàojī, [電報機], telegraph
纺织机 铲土机 chǎntǔjī, [鏟土機], earth-moving machine/mechanical digger
停机场 停机库 有机磷 yǒujīlín, [有機磷], organic phosphate
靶机 bǎjī, [靶機], target drone
蒸气机 电焊机 机井 公务机 机械式 汽机 磁带机 cídàijī, [磁帶機], tape drive
投机性 民航机 钻机 冰机里 汽轮机 qìlúnjī, [汽輪機], steam turbine
小型机 母机 mǔjī, [母機], machine tool/mother ship
机械厂 机宜 jīyí, [機宜], guidelines/what to do (under given circumstances)
机床 jīchuáng, [機床], machine tool/a lathe/CL:張|张[zhāng]
军用机 机炮 机务段 jīwùduàn, [機務段], locomotive depot
歼击机 jiānjījī, [殲擊機], fighter plane
机播 钻探机 zuāntànjī, [鑽探機], drilling machine
裸机 luǒjī, [裸機], hardware-only device/computer without operating system or other software install...
锻压机 驱逐机 机降 机械论 反潜机 巨型机 预警机 yùjǐngjī, [預警機], early warning aircraft system, e.g. US AWACS
接收机 jiēshōujī, [接收機], receiver/TV or radio receiver
挖土机 wātǔjī, [挖土機], excavator/backhoe
轻机枪 qīngjīqiāng, [輕機槍], light machine gun
发电机组 燃气轮机 ránqìlúnjī, [燃氣輪機], gas turbine
包装机 通风机 装载机 机动船 机场路 使手机 磨光机 生机盎然 shēngjīàngrán, [生機盎然], full of life/exuberant
步行机 卷烟机 机架 坐失良机 zuòshīliángjī, [坐失良機], to sit and waste a good opportunity (idiom); to lose the chance
教练机 jiàoliànjī, [教練機], trainer (aircraft)
汽油机 qìyóujī, [汽油機], gasoline engine
脱水机 tuōshuǐjī, [脫水機], a device for extracting water (such as a centrifuge)
微机室 延机 发送机 暖风机 装机 zhuāngjī, [裝機], to install/installation
机工 采煤机 机甲 jījiǎ, [機甲], mecha (human-operated robots in Japanese manga)
机种 机收 电影机 纺纱机 机器人学 jīqìrénxué, [機器人學], robotics
打卡机 播种机 有机玻璃 yǒujībōli, [有機玻璃], plexiglass
挤奶机 整机 机器声 有机酸 抽风机 chōufēngjī, [抽風機], exhaust fan
打谷机 dǎgǔjī, [打穀機], threshing machine
影机 裁纸机 cáizhǐjī, [裁紙機], trimmer/paper cutter
新机 枢机主教 shūjīzhǔjiào, [樞機主教], cardinal (of the Catholic Church)
冲压机 捻线机 单机 随机数 suíjīshù, [隨機數], random number