We use a leash to walk our pet dogs, The leash keeps dog from running away or getting into trouble.

VOA: special.2009.03.29

It just keeps getting extended.

要交的人越来越多，没完没了。

斯坦福公开课 - 经济学课程节选

The beauty of this is, it keeps me from getting lazy, and not only testing my program and the thing that found the bug, but in all the things that used to work.

运行函数而不用再输入了，这其中的,美妙之处在于，它让我变的勤快了点,并不是仅仅的去测试程序发现bug方面，同样适用于那些正常工作的模块。

麻省理工公开课 - 计算机科学及编程导论课程节选

As the mulch breaks down, it provides material that keeps the soil from getting hard.

VOA: special.2009.06.30

And the waxy oil keeps ears from getting too dry.

VOA: special.2010.03.31