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。
它非常有用。
I like self — studying I think it is very useful.
我喜爱自我学习我认为这是非常有用的。
I study English hard, because I know it is very useful.
我学习英语很努力，因为我知道它很有用。
I like English too, but I like the computer class best. It is very useful.
我也喜欢英语，但我最喜欢电脑，电脑很有用。
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。
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。
I think it is a very good useful concept.
我认为这是一个很好的有用的理念。
This can be very useful, but it is not needed in this case.
此属性会非常有用，但是在本例中不需要它。
It might be very useful. But now it is gone.
——或许很有用吧，但是现在文件已经没有了。
When selecting computer hardware, it is very useful to remember a few principles.
在选择计算机硬件的时候，记住几条原则是很有帮助的。
It is very important to diagnose the core dump to extract useful information.
重要的是诊断核心转储以便提取有用的信息。
It is very, very useful for debugging.
这个特性对调试非常有用。
It is very important to Mom to feel useful.
觉得自己能发挥作用，这对母亲来说太重要了。
It is a very useful tool for learning about Ruby and its modules.
Ruby控制台是学习Ruby及其模块的一个非常有用的工具。
I think English is very useful and it is very difficult and exciting.
我认为英语是非常有用的它是非常困难和令人兴奋的。
这是非常容易的，但有益的。
It is a very useful plant that can be prepared in many different ways.
这是一种非常有用的、可以用许多不同方法来制备的作物。
First of all, it is a very useful communication tool.
首先，它是一个非常有用的沟通工具。
It is a very useful and handy utility.
这是一个非常有用和方便的工具。
It is a very useful tool and save your money.
这是一个非常实用的工具，而且还可以省钱。
While English can be difficult to learn, it is a very useful tool for communication.
尽管英语学起来可能有点难，但它是非常有用的交际工具。
Because it is very useful, especially when China has joined the WTO.
学一门双学位非常有用，尤其是在中国加入WTO之后。
I think it is a very useful international language especially when working with foreigners.
而且我认为英文是很重要的国际语言，尤其是和外国人工作的时候。
Thank your for you suggestion. It is very useful for us.
谢谢你的建议，他对我们非常有用。
Neil: Yes, it is very useful but we'll just have to finish there.
是的，非常有用，但是我们要在这里结束了。
Thank your for your suggestion. It is very useful for us.
谢谢你的建议，他对非常有用。
It is very useful to learn English well.
学好英语非常有用。
It is very useful to learn English well.
学好英语非常有用。
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