Sometimes it will be that because the region has a strange shape, you can actually set it up more easily one way or the other.
但若是积分域形状比较古怪的话，某一积分次序可能比另一种更简便些。
Other classmates think it is strange than they two can be even friends, but they are best friends at that time.
其他同学都认为他们两个能够成为朋友是件很奇怪和不可思议的事情，但是他们当时确实是最好的朋友。
It seems so strange that sometimes fate can appear to be so real, and yet turn out to be a fantasy.
似乎是那么奇怪，有时候命运能够如此现实地出现，然而结果不过是个梦想。
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