题目内容
采用Coverage数据模型，相邻多边形公共边界被重复存贮。
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矢量数据模型
It is so difficult to ________ the bottom of the ocean because some parts are very deep.
We often ________ that when other people do the same things as we do, they do them for the same reasons; but this assumption is not always reasonable.
After a ________ physical exam, my doctor said I was in good condition except that my blood pressure was a little high.
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