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问题: on occassion 还是 on occassions?

on occassion 还是 on occassions?到底哪一种用法是正确的呢?

解答:

应是:on occassion =occassionally 有时,间或,偶尔,这是一个习惯用语.

或者是:on differment occassions/on those occassions of...等,这时的occassions表示若干不同的场合/事件/仪式/情况/机会等