One way to think about it, if you're really still attached to the idea of double integral as a volume what this measures is the volume below the graph of a function one.
一种考虑这个问题的办法是，如果你还觉得，二重积分是求体积的话，那这个度量的，就是函数1的图形下的体积。
The way we actually think of the double integral is really as summing the values of a function all around this region.
就二重积分来讲,它是对区域里函数值求总和。
The first double word of every frame points to the next frame and this is immediately followed by the address of the calling function.
每一帧的第一个双字（double word）指向下一帧，这后面紧跟着调用函数的地址。
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