... defining postulates定义公设 defining integration定义积分 defining fixed point定义固定点 ...
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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.
而且我们能用线积分的定义计算出来。
And this we can compute using the definition of the line 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.
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