当你听到它的时候，你就明白了。

You simply know it when you hear it.

youdao

这一切似乎是意料之外，当你听到它，它就会送你步履蹒跚。

This all seems to be unexpected, and when you hear it, it will send you reeling.

youdao

这是一个很长的故事，当你听到它的时候，你会哭的。把药箱递给我好吗？

It's a long story, when you heard it, you would cry. Could you hand me the medicine box please?

youdao