当某人递给我们一封信，递给我们一本书，给我们一杯饮料，或者借给我们一把伞时，我们就会说它们。

We say them when someone hands us a letter, passes us a book, offers us a drink, or lends us an umbrella.

youdao

打扰一下，我收到一封信说我该还一本书，它是我九月份借出的，书名是《现代社会问题》。

Excuse me, I received a letter that I am supposed to return a book that I checked out back in September, it's called Modern Social Problems.

youdao

嗯，我在邮箱里收到一封信，说我应该归还我一月份借的一本书，书名是《现代社会问题》。

Well, I received a letter in my mailbox saying that I'm supposed to return a book that I checked out back in January, it's called "Modern Social Problems".

youdao

The Letter to the Hebrews,one letter of John, he rejects the Shepherd of Hermas,which is a book that we include in a groupings of writing we call the Apostolic Fathers.

希伯来书，它是约翰的一封书信，他摈弃了黑马牧人书,我们把它列入了使徒教父文集里。

耶鲁公开课 - 新约课程节选