Don't ask the barber whether you need a haircut.

不要问理发师你是不是需要理发了。

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Trying to decide whether you need a CV or resume?

在考虑你是需要履历还是简历？

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We’ve written out a brief guide to deciding whether you need a tablet at all.

我们已经写了一篇关于“拥有平板电脑是否真的那么必要”的简短指引。

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And often, if you want to make a lot of it, you have to think about the thermodynamics of the system, how fast the reactions will go and kinetics, and then whether they'll go, the thermodynamics, and sometimes then you need to adjust the reactions, maybe use a transition metal to make it go better.

这种分子就不能正常工作，而且通常来说,如果你要大量生产一个东西,你必须考虑系统的热力学，反应速率和动力学,还有反应是否会发生，热力学，而且有时候你需要调整反应的发生。

麻省理工公开课 - 化学原理课程节选

Because at the end of the day, if game theory is going to be useful for you in your later lives, whether it's in dating or in running a company or whatever it happens to be, you need to able to go from the story to the model.

因为到最后,如果你们在以后想要运用博弈论,不论是用在约会上还是在运作一家公司上,或者其他的什么情况,你需要从具体情况中提炼模型

耶鲁公开课 - 博弈论课程节选

You simply enter the time and place of the trip, maybe adding extras like whether you need a hotel, a rental car or a dinner reservation.

FORBES: Magazine Article

In fact, given the interactive nature of social media, and the ability it gives you to form a community with clients, some are now even questioning whether you still need a website.

FORBES: Is Your Website A Dinosaur?

Albro named Nolo.com one of the best sites for explaining legalese in understandable terms that can help you determine whether you really need a lawyer.

CNN: dotCOM Tools: Legal services online