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。
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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