在火灾中好几本对我的工作很重要的书丢了，因此这工作要继续下去将是很困难的。

Several books that were very important for my work were lost in the fire, and it's going to be difficult to gather the threads.

youdao

我把书丢了，我本该上周还给图书馆的。

I have lost the books. I ought to have returned them to the library last week.

youdao

我把书丢了，我本该上周还给图书馆的。

I have lost the books. I ought to have returned them to the library last week.

youdao