因此，模板系统必须将表单与函数分离，但还必须在两者之间建立联系。
Hence, a template system must separate form from function, yet also bridge the divide.
实际上你已经联系过这种思维跳跃了，就在你使用内置函数的时候。
In fact, you are already practicing this leap of faith when you use built-in functions.
而一个偏微分方程就是，函数各个偏导之间的联系，看看。
And a partial differential equation is some relation between its partial derivatives. Let me see.
二元函数的极限远比一元函数的极限复杂，但它们之间又有密切的联系。
Limit of function of two variables is more complex than that of one variable.
二元函数的极限远比一元函数的极限复杂，但它们之间又有密切的联系。
Limit of function of two variables is more complex than that of one variable.
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