函数是连续可微分的。

Not all continuous functions are differentiable.

youdao

函数是连续可微分的。

The function is continuously differentiable.

youdao

现在，虽然这一切听起来很简单，在理论上，明显有相当数量的实际问题之前，必须克服偏微分方程的工作，可建。

Now while this all sounds pretty simple in theory, there are clearly quite a number of practical problems to be overcome before a working PDE can be built.

youdao