Origin and priority are almost always useful, but you should define others that are suited to your project.

来源和优先级几乎总是有用的，但你必须定义适合你的项目的其他属性。

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Praise is always nice to receive, but criticism can often be so much more useful.

赞美是总令人欣然接受，但批评，往往可以有更多的用处。

youdao

But this might not always be useful.

但是此方法并非始终有用。

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If you have a real gas and you write du is Cv dT and your path is not a constant volume path, then you are making a mistake. But for an ideal gas, you can always write this. And this turns out to be very useful to remember.

对于真实气体，如果其变化过程,不是恒容的，du=Cv*dT就不成立，但对于理想气体,这条规则永远成立,这一点非常有用，请记住。

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They would clam up a bit when you asked what else the opposition could do to get things to change, but the meetings were always useful.

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But before examining why, it's always useful to see what lessons can be learned from the past, and the Large Hadron Collider (LHC) provides a useful case study.

ECONOMIST: Science

This technique does not always work, but sometimes it can be quite useful.

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