第4到7位数字告诉你数字被记录在哪个区域。
The fourth to the seventh digits tell you which area the number is recorded in.
前言：目的研究一种数字图像中不规则轮廓区域面积的测量方法。
Objective: To study method of area measurement for the irregular region in the digital image.
新确认的区域将在数字后跟随一个字母标示。
Newer areas are identified by a letter accompanying the number.
新确认的区域将在数字后跟随一个字母标示。
Newer areas are identified by a letter accompanying the number.
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