They don't know what happened to them three seconds ago.

他们不知道三秒中之前发生的事。

youdao

They don't know what happened to them three seconds ago .

他们不知道三秒钟前他们发生过什么事。

youdao

They don't know what happened to them three seconds ago .

他们不知道三秒钟前他们发生过什么事。

youdao