我对图书馆里书籍的数量感到惊讶。

I was amazed at the ___quantity of books in the library.

我们担心这批货中残次品的数量。

We were concerned about the ___quantity of defective products in the shipment.

一家当地慈善机构为无家可归者收集了大量冬衣。

A local charity collected a large ___quantity of winter coats for the homeless.