If so, you should know that it is wise to keep a book in your purse or car at all times, as you never know when you'll find yourself with some time to kill.

如果你遇到过这样的情况，你就会知道在你的包里或车里始终放一本书是多么明智的选择，你永远都无法预知自己什么时候会遇到需要消磨时间的情况。

youdao

How long may I keep a book?

一本书可以借多久？

youdao

How long can I keep a book?

一本书能借多长时间？

youdao

Sometimes he did not even keep a copy of his book.

VOA: special.2010.01.10

The duke was said to keep a book of prayers in his jacket.

ECONOMIST: Duke of Norfolk

Borrowers can keep a book for as long as they like, but when they borrow a new title, the previously borrowed book automatically disappears from their device.

FORBES: Amazon Giving Free Books To Kindle Users, Apple Battle Heats Up

In practice, they accept special offers to members of a loyalty club, or to people who book tickets early or keep a big balance on an account.

ECONOMIST: Managing customers