学习资料
[意 思]n. 场合
[例]  I only wear a tie on special occasions.
我只在特殊场合才打领带。
n. 机会,时机
[例]  I'll speak to him on the first occasion.
一有机会,我就告诉他。
n. 起因,近因
[例]  Her departure was the occasion of much sadness. 她的离别是令人十分悲伤的起因。
n. 理由,需要
[例]  You have no occasion to buy another car.
你没有必要再买一辆汽车。