Why do we like partial derivatives?

为什么我们偏爱偏微分呢？

We are trying to understand partial derivatives.

我们还要试图理解偏导数。

It has only partial derivatives for each variable.

它只有关于每个变量的偏导数。

Suppose and have continuous partial derivatives on.

设，在上有连续的偏导数。

So, we have to figure out what we mean by partial derivatives again.

因此，我们应该重新理解偏导数的含义。