In some places, you may borrow as many books as you want, but in others you are limited to a certain number of books for several weeks so that you can have enough time to finish all the books you've borrowed.

在一些地方，你可以想借多少书就借多少，但在其他地方，你只限于借阅一定数量的书几个星期，这样你可以有足够的时间读完所有已借的书。

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Each marshmallow cloud can hold a certain number of people.

每个棉花糖云都能承载一定数量的人。

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They had all been invited and each person who was invited has to bring with him a certain number of silver and gold coins.

他们都被邀请了，每个受邀的人都必须带着一定数量的银币和金币。

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Members can order a certain number of movies from the Netflix Web site.

VOA: special.2009.09.25

Now, recruiting is tremendously important because you need to have a certain number of settlers to make the settlement viable.

招募是极其重要的,因为你需要有一定数量的移民,来维持居住地的运转

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An insurance company has reserves and it has enough reserves to cover them for a certain number of accidents.

保险公司一般都有准备金,准备金的数量一般保持在,刚刚够赔偿一定数量的保单

耶鲁公开课 - 金融市场课程节选

Seasonal scheduling is when employees work only a certain number of months a year.

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Have those service providers required you to invite them to a certain number of deals?

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For example, most states require a certain number of outdoor and indoor square feet per child.

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