/əˈkeɪʒn ||; əˈkeʒən/noun1 [C] a particular time when sth happens （某事发生的）时刻，时候；场合: I have met Bill on two occasions. 我见过比尔两次。
2 [C] a special event, ceremony, etc 特别的活动；典礼: Their wedding was a memorable occasion. 他们的婚礼是值得纪念的大事。
3 [sing] the suitable or right time (for sth) （做某事的）时机，机会: I shall tell her what I think if the occasion arises (= if I get the chance). 待有合适的时机，我就会把我的想法告诉她。 ☞You use occasion when you mean the time is right or suitable for something I saw them at the funeral, but it was not a suitable occasion for discussing holiday plans. You use opportunity or chance when you mean that it is possible to do something I was only in Paris for one day and I didn't get the opportunity/chance to visit the Louvre. 指某时刻适合做某事时，用occasion：I saw them at the funeral, but it was not a suitable occasion for discussing holiday plans.我在葬礼上见到他们，但那不是讨论假期计划的适当时候。指某时刻有可能做某事情时，用opportunity或chance：I was only in Paris for one day and I didn't get the opportunity／chance to visit the Louvre.我只在巴黎逗留了一天，没有机会去参观罗浮宫。
on occasion(s) sometimes but not often 有时；偶尔