You should pick the number of tiers you need based on how fine-grained you want to make your search.

您应该根据搜索所需的粒度来选择层数。

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Your doctor can review any special precautions you need based on your condition or medications you might take.

你的医生可以依据你的状况重新检查，以有任何特殊的预防或者是药物治疗。

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Composite applications enable the integration of information from multiple applications, providing users with the content they need based on their role and task.

复合应用程序支持集成来自多个应用程序的信息，根据用户的角色和任务为他们提供内容。

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Awards may be based on financial need or on grades, talents or other requirements.

VOA: special.2009.02.19

So, I infer the existence of atoms based on the fact that doing that allows me to explain things that need explaining.

所以说我推测原子的存在是基于,该假设使得我能够解释,所需解释的一些现象

耶鲁公开课 - 死亡课程节选

Now we need to think about a model of the stock market And the model we're going to use is based on what's called the Efficient Market Hypothesis.

现在需要想一想一个股市的模型是怎样的,我们要用的模型是,基于有效率市场假说的。

麻省理工公开课 - 计算机科学及编程导论课程节选

Tuition assistance, much like merit-based and need-based scholarships, can be offered by private citizens through community partnerships with creative financing.

FORBES: Why Rahm Emmanuel Should Use More School Vouchers

For every additional dollar you make, you lose a certain amount of need-based aid.

FORBES: The Tax Collector With the 47% Rate

Families too wealthy for need-based aid are turning to the tax code to help pay the bill.

FORBES: 10.06.03, 7:00 AM ET