如果你丢失的话，我的孩子们经常丢书，你必须买一本新的还给图书馆。

And if you don't, you'll pay the penalty and if you lose it, which my children do sometimes, you have to replace it and buy them a new book or video.

youdao

如果你丢失的话，我的孩子们经常丢书，你必须买一本新的还给图书馆。

And if you don't, you'll pay the penalty and if you lose it, which my children do sometimes, you have to replace it and buy them a new book or video.

youdao