一旦我们做出了选择，同时也就可以定义通量积分。
Now, once we have made a choice then we can define the flux integral.
实际上，我们对二重积分的定义并不严谨，那应该怎样严格地定义它呢？
OK, so actually, how do we define it, that's not really much of a definition yet.
这就是二重积分的基本定义了。
本文就非正常积分的定义提出了一些看法。
Viewpoint which are about definition of the non-normal integration are given in this paper.
本文就非正常积分的定义提出了一些看法。
Viewpoint which are about definition of the non-normal integration are given in this paper.
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