黑盒和白盒属性并不是一个元素的内在特性，注意到这一点非常有用。

It's useful to note that black and white box attributes are not inherent characteristics of an element.

youdao

当您编写构建文件时这一点非常有用，可以确保它能够发挥所有的作用。

This is useful when writing the build file, to help ensure that it is fully functional.

youdao

这一点非常有用，因为可以挂载快照，然后恢复之前删除的文件，或者检查之前版本的文件。

This is quite useful, as you can mount a snapshot and recover files that were previously deleted or check previous versions of files.

youdao

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。

麻省理工公开课 - 热力学与动力学课程节选