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

他不知道三秒种前他们发生了什么事。

youdao

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