“条子”是一张写着几个字的小纸条，人们用它来留言或者记录事情。

A “条子” is a small piece of paper with a few words written on it, used by people to leave messages or record things.

在口语里，“条子”有时也是警察的意思，不过这种说法不太正式。

In spoken language, “条子” sometimes also means police, but this usage is informal.