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n (1)特定時(shí)刻(particular time esp as marked by certain circumstances)[C]：on this/that/the present/the last/one～在這一時(shí)刻/在那一時(shí)刻/這次/上次/有一次;They on several～s almost took my life.有幾次他們還差點(diǎn)要了我的命。I send my best wishes on this happy～.在這幸福的時(shí)刻，我送上最美好的祝愿。I can't recall the～，but I've met her before.我以前碰到過(guò)她，但想不起在哪個(gè)場(chǎng)合了。He looked round at them all and made an effort to rise to the～.他環(huán)顧他們每一個(gè)人，想努力應(yīng)付好這個(gè)局面。It is considered too informal an attitude for such an～.人們認(rèn)為，在這樣的場(chǎng)合采取這種態(tài)度是過(guò)于隨便了。have a sense of～有場(chǎng)合感;

(2)(時(shí))機(jī)，機(jī)會(huì)(opportunity)[C，sing][N(for)]：I want to take/use this～to thank you.我想利用這個(gè)機(jī)會(huì)來(lái)感謝你。Christmas is always an～for merry-making.圣誕節(jié)始終是歡慶的時(shí)刻。This is not an～for lazy walks/laughter/tears.這不是漫步/開(kāi)懷大笑/痛哭流涕的時(shí)候。If the～presents itself，I shall speak to him.如果有機(jī)會(huì)，我會(huì)跟他講。He never missed any～of visiting the castle.他從來(lái)不錯(cuò)過(guò)游覽這座城堡的機(jī)會(huì)?！纪?opportunity，chance，instance，circumstance;

(3)特殊事件，盛事(會(huì)，舉)(special event or celebration)[C]：The country's bicentennial was quite an～.該國(guó)建國(guó)200周年紀(jì)念相當(dāng)隆重。Let's make our wedding an～to remember.讓我們把婚禮辦成永遠(yuǎn)銘記的盛會(huì)。They have the date fixed for the big～.他們已將舉行這個(gè)盛大集會(huì)的日子定了下來(lái)?！纪絜vent，occurrence，happening;

(4)理由;必(需)要(reason;need;requirement)[U](fml)：You have no～to do that/be angry.你沒(méi)有理由去做那件事/生氣。There was no～for a doctor.沒(méi)有必要請(qǐng)醫(yī)生。The debate had to be postponed，by～of the illness of one of the principal speakers.由于主要發(fā)言人之一患病，辯論不得不延期舉行?！纪?reason，cause，need;

(5)起(近)因(immediate but incidental cause of some action or result)[C](fml)：The dog which was the～of the quarrel had run away.引起這場(chǎng)爭(zhēng)吵的那條狗跑掉了。The real causes of the strike are not clear，but the～was the dismissal of two workmen.罷工的真正原因不太清楚，但起因是兩個(gè)工人被解雇。What was the～for all that laughter?這都是笑什么?

on occasion 有時(shí);必要時(shí)(fml)：I ride my bicyele on～.我有時(shí)騎自行車(chē)。

on the occasion of sth值此……之際，在……的時(shí)候(fml)：We bought her the picture on the～of her 70th birthday.我們?cè)谒?0歲生日時(shí)給她買(mǎi)了這幅畫(huà)。

v 引起(be the cause of sth.)(fml)[T+n，D+n+n，D+n+prep(to)]：What～ed his remark? 是什么引起他這番話? The remark～ed a burst of applause.這番話引起一陣掌聲。His behaviour～ed (us) a lot of trouble/much anxiety.他的所作所為(給我們)惹了許多麻煩/使我們非常擔(dān)心。This discovery～ed me no surprise.這一發(fā)現(xiàn)并沒(méi)有使我感到驚奇。The lack of cooperation～ed much grief to them.缺乏合作給他們?cè)斐稍S多痛苦。

→occ′asional adj 不時(shí)的，偶然的;應(yīng)對(duì)的;oc′casionally adv不(有)時(shí);偶爾;

【辨異】1)occasion 與opportunity和chance的區(qū)別見(jiàn)CHANCE。2)occasion與cause的區(qū)別見(jiàn)CAUSE。