本文通过讨论广义重积分与广义逐次积分之间的关系，得出一些结论，并将相应结果推广到广义三重积分与广义三次积分中。
In this paper, some relationships between improper double integral and improper iterated are discussed, and the corresponding results are generalized into the improper triple integrals.
从货币在原始生活中演变的方式，我们可以了解到它的三重职能。
We can see its three-fold function in the manner in which it evolved in primitive life.
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