The memory state of each byte of memory is represented by one of these letters R, Y, G, or B. These letters correspond to the colors red, yellow, green, and blue, respectively.
每个内存字节的内存状态都用下面的字母来表示 R，Y，G，或者 B。 这些字母相应的子目分别代表的是红色，黄色，绿色以及蓝色。
So, we said vertically simple egion looks like x goes between a and b, and y goes between two values that are given by functions of x.
我们说过简单的竖直区域是x在a与b之间，而y在x的函数值两个值之间。
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