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？
Application to epidemiology - why is it useful for us?
方法的应用-为什么对我们有用?。
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。
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？
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。
它很实用，不是吗？
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。
It has many omissions; even so, it is quite a useful reference book.
那本书有许多遗漏之处，即使如此，尚不失为一本有用的参考书。
And we should not imagine that it is. But it is a very useful tool.
并且我们也不应该这样设想，但是这确实是一个很有用的工具。
Large page is useful but it should be used in specific scenarios.
大页面是有用的，但是只应该在特定的场景中使用。
It is truly a useful technology for a specific data problem.
对于一个特定的数据问题，它的确是一项有用的技术。
这是一本很实用的书。
这是一个有帮助的警告。
But it is probably more useful and certainly less dangerous.
但是它可能更加有用也无疑危险程度更低。
It is very, very useful for debugging.
这个特性对调试非常有用。
I hope it is useful. It's all I know.
我希望这是有用的，我竭尽所知。
It is actually useful for various physical applications.
实际上在物理应用上很有用。
However, it is useful even if you don't use TDD at all.
即使您不使用TDD这个功能也是非常有用的。
English is fairly useful, but it is rather difficult to learn.
英语相当有用，但相当难学。
And we should not imagine that it is.But it is a very useful tool.
并且我们也不应该这样设想，但是这确实是一个很有用的工具。
In this particular question it is not very useful.
在这个特别的问题中这不是很有用。
This is useful, but it might not be what you want.
这很有用，但可能不是您想要的功能。
It is not true security, but it can be useful in certain contexts.
这并不是真正的安全，但该方法在某些情况下很有用。
It is not true security, but it can be useful in certain contexts.
这并不是真正的安全，但该方法在某些情况下很有用。
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