接下来就是，很不严谨地去谈论这个世界。
What's the rest, the rest is something talking loosely to say about the world.
实际上，上面的证明过程是不严谨的。
当然，这种说法虽然形象，但并不严谨。
Certainly, this kind of parlance although image, not careful.
但是只凭相信并不严谨。
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.
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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