What is PWM and why is it useful?
什么是PWM和为什么它有用吗？
Why is it useful for the task of caching?
为什么它对缓存任务非常有用呢？
Is it useful for you to learn English?
学英语对你来说有用吗？
有用吗？
That's a mouthful-but is it useful or even meaningful?
这个定义很长，但它是否有用或者甚至有意义？
Application to epidemiology - why is it useful for us?
方法的应用-为什么对我们有用?。
You just would like to get some information. Is this exhibition ok? Is it useful for selling the goods, right?
您主要是想了解一些信息。那您觉得这次展会还可以吗？对销售产品有效果吗？
Nor is it useful any longer to employers, who can reasonably assume that anyone under the age of 40 is as familiar with computers as they are with, say, televisions or radio sets.
对雇主来说，这些课程也不再有用了，他们有理由认为那些小于40岁的人，对电脑的熟悉程度如同对电视或者收音机的程度。
It concludes with a very useful summary of key points, with cross-references to where each key point is dealt with in the book.
它在结论中对要点进行了非常有用地总结，并标出了书中讲述每个要点的参照章节。
This technique is useful but it has its limitations.
这种技术实用，但也有局限性。
Because of this, young people choose to learn a common language as they think it is more useful.
因此，年轻人选择学习一门常用的语言，因为他们认为这是更有用的。
The focus is really on eruptions in the last five years, but it might have some useful background material.
人们关注的焦点其实是过去五年的火山爆发，但它可能会提供一些有用的背景资料。
It is especially useful for increasing flow of the lymphatic system.
它对增加淋巴系统的流量特别有帮助。
The energy absorbed by the chlorophyll molecules of the unstable autumn leaf is not immediately channelled into useful products and processes, as it would be in an intact summer leaf.
不稳定的秋叶叶绿素分子吸收的能量，不会像在完好的夏叶中吸收的能量那样立即传输到有用的产品和工艺流程中去。
Experts see a movement toward the use of mobile technology in education, though they say it is in its infancy as professors try to come up with useful applications.
专家们看到了移动技术在教育中应用的趋势，不过他们说，随着教授们试图提出有用的应用，移动技术还处于起步阶段。
Some parents now are choosing to save the cord blood, have it frozen, locked away somewhere just in case it is useful to their child later in life.
现在有些父母选择保存脐带血，把它冷冻起来，锁在某个地方，以防日后对孩子有用。
Can you persuade the man on the Clapham omnibus that it is useful?
你能让普通人相信这个很有用吗？
Even if I don't spell out all the details, you can still make some useful logical inferences, namely, the shop is open and it sells coffee.
即使我没有把所有的细节都说出来，你仍然可以做出一些有效的逻辑推论，也就是说，这家店是开着的，而且它卖咖啡。
"Thanks" can be useful, as it is able to bridge the divide between the formality of "thank you" and the downright relaxed "cheers".
“Thanks”很有用，因为它能够在正式的“thankyou”和完全放松的“cheers”之间架起一座桥梁。
Some have compared the Hollywood studio system to a factory, and it is useful to remember that studios were out to make money first and art second.
有些人将好莱坞的电影制片厂制度比作工厂，而且有一点要记住的是，制片厂的首要任务是赚钱，其次才是艺术。
Such an argument is plausible, however, it is less useful for understanding the sociopolitical implications of water use and control in other, water-rich parts of the Maya region.
这样的论据是有道理的，然而，对于理解玛雅地区其他富水地区的用水和控制的社会政治影响来说，就没那么有用了。
Algebra is not easy for everyone to learn, but it is very useful.
代数对每个人来说都不容易学，但它非常有用。
Marking a book is a useful skill, but it's important to do it right.
在书上做标记是一项有用的技能，但重要的是要做对。
These methods may be useful for a while, but it is difficult to solve this problem completely.
这些方法可能暂时有用，但要完全解决这个问题是很困难的。
它很实用，不是吗？
It would be so easy if you built a cohesive system that carries the entire transaction to create a receipt that is useful.
如果你建立一个能覆盖整个交易过程，并产生有效的收据的内聚系统，一切都会变得更容易。
Life is very stressful nowadays, so it is useful for us to talk about how to cope with stress.
现在的生活压力很大，所以谈谈如何应对压力对我们很有用。
It is still true that a dog is the most useful animal in the world.
狗是世界上最有用的动物，这一点仍然是正确的。
One doctor thinks he has rediscovered an old weapon that could be useful in the fight against these nasties. It is honey.
有一位医生认为，他已重新找到了一种古老的武器，可以用来抵御这些“讨厌的家伙”。这就是蜂蜜。
One doctor thinks he has rediscovered an old weapon that could be useful in the fight against these nasties. It is honey.
有一位医生认为，他已重新找到了一种古老的武器，可以用来抵御这些“讨厌的家伙”。这就是蜂蜜。
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