你必须考虑到一定数量的错误。

You have to allow for a certain amount of error.

《柯林斯英汉双解大词典》

我仍旧为他们做一定数量的工作。

I still do a certain amount of work for them.

《柯林斯英汉双解大词典》

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。

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.

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The goldsmith might also write notes promising so much gold and not promising the return of any particular item of gold.

这个金匠会写下票据,保证归还一定数量的金子,但是不保证归还某个特定的金器

耶鲁公开课 - 金融市场课程节选

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

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

耶鲁公开课 - 古希腊历史简介课程节选