1/happen的释义:

vi. 发生碰巧偶然遇到

2/happen的用法例句:

You can never guess what will happen in the future.

你永远猜不到将来会发生什么事。

3/happen的词组有:

happen to be碰巧是恰巧是

as it happens碰巧偶然发生

happen on偶然遇到或发现