(一).How did it happen? 这是怎么回事?

原音重现：

A：I heard that Willis died last week.

我听说威利斯上周去世了。

B: That's terrible. How did it happen?

太让人吃惊了。怎么会这样?

(二).What's going on?出什么事了?

原音重现：

A：What's going on? I see a lot of police.

出什么事了?那么多警察。

B: I think someone robbed the bank.

可能有人抢银行了吧。