When you are given a piece of data in the statement of a problem, you have to figure out whether that is part of a function to be integrated or whether that is part of the region of integration.
题目给出了积分的条件，就必须要弄清楚，什么是积分的函数，什么是积分区域。
When you are given a piece of data in the statement of a problem, you have to figure out whether that is part of a function to be integrated or whether that is part of the region of integration.
题目给出了积分的条件，就必须要弄清楚，什么是积分的函数，什么是积分区域。
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