但如果，密度可能是变化的，因为它是许多金属的混合物，或者厚度在变化等等，但你仍然可以通过对密度积分得到质量。

But if, actually, it has varying density maybe because it is some metallic thing with various metals or with varying thickness or something then you can still get the mass by integrating the density.

youdao

我要说的是取其一，积分得到包括另一变量的函数的结果，然后对结果求导，进行比较看得到什么。

But what I am saying is just take one of them, integrate, get an answer that involves function of the other variable, then differentiate that answer and compare and see what you get.

youdao

另外的20000名(受希尔顿积分变动影响的)客人将分得4亿“优越会”积分，这将作为他们从Hilton计划中损失的补偿。

Another 20, 000 hotel patrons will share in up to 400 million Priority Club points as compensation for what they are losing under the Hilton program.

youdao