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(1)(意外)事故(災(zāi)禍)(unexpected happening，often causing damage，injury，loss，death，etc)[C，U(without～)]：have (meet with) a road/traffic～出交通/交通事故;have (meet with) a car/motoring/carriage/bicycle/railway～出汽車/汽車/馬車/自行車/火車車禍;have an～at work/at home 工作時(shí)/在家里出了事故; be killed/break one's leg in a skiing～在一次滑雪事故中喪生/跌斷了腿;A sad/bad/slight～happened (occurred).發(fā)生了一起可悲/糟糕/小小的事故。A～s will happen.(prov)不幸的事在所難免。without～平安無(wú)恙地;～insurance 意外傷害保險(xiǎn);the scene of an～事故地點(diǎn);〖同〗crash，wreck，mischance;

(2)偶然發(fā)生的事(any event that happened unexpectedly)[C]：It was just/quite an～that I found the missing letter.我發(fā)現(xiàn)那封丟失的信純屬偶然。Our meeting was a mere～.我們的見(jiàn)面純粹是偶然。The discovery was a happy～.這一發(fā)現(xiàn)令人意外地高興。The fact is due to a historic～.這一事實(shí)是由于歷史的偶然造成的。〖同〗chance;〖反〗plan，intention，design;

(3)機(jī)遇;幸運(yùn)(chance;fortune;luck)[U]：Columbus discovered America by～.哥倫布意外地發(fā)現(xiàn)了美洲。run across sb/meet sb/be somewhere quite by～極其偶然地碰上某人/遇見(jiàn)某人/在某處;It was quite by～that we arrived together.我們一塊到達(dá)完全是巧合。By～of birth he was rich.他富有是因?yàn)橥短サ搅擞绣X人家?！纪絚hance，luck，fortune;

→ ?acci′dental adj 意外(偶然)的;?ac-ci′dentally adv 意外(偶然)地;′accident-prone adj 特別易出事故的