It is very useful to learn English well.
学好英语非常有用。
It is very useful to use a miniature reflex camera.
使用小型反光镜照相机很有用。
It is very useful to sit down with pencil and paper at this point.
这种情况下，好好拿了纸笔坐下来是挺有用的。
It is very useful to classify demand factors into these categories.
将需求因素加以归类非常实用。
It is very useful to classify demand factors into these categories.
它是将需求因素加以非常有用。
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。
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。
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 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。
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。
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。
English can be difficult to learn, it is a very useful tool for communication.
尽管英语难学，但它对于交流很有用。
It is very useful if make-up is to look very effective.
这是非常有用化妆是看非常有效。
It is very useful for us to develop the quality of grinding tee...
这对于提高磨齿质量，加深对磨齿的认识是非常有用的。
It is very useful for us to develop the quality of grinding tee...
这对于提高磨齿质量，加深对磨齿的认识是非常有用的。
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