But, once you've reduced it to an actual change of variables problem, I expect you to be able to know how to do it.
不过，用变量替换的办法来做的话。。。,希望你们能知道怎么去做这种题。
2
In the line integral in the plane, you had two variables that you reduced to one by figuring out what the curve was.
在平面上的线积分中，有两个变量，可以通过了解曲线的形成规律，从而去掉一个变量。
3
However, the allocation of variables to memory Spaces is unlikely to be optimal as program development progresses, resulting in reduced performance of the generated code.