Removing some of the enlargement of the central area does make this part of the map more difficult to read.

中央区域一些部分放大的减少使得该部分地图阅读起来更加困难。

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In the enlargement model used transfer principle, the differential of vector-valued function is defined by locally liner map.

在非标准扩大模型下，利用转换原理，通过定义局部线性函数给出向量函数微分的定义。

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