随着这座城市不断扩大，其邻近的村庄面积缩小到原来的一半。
As the city continues to expand, its neighboring village shrinks to half of its original size.
这就是为什么面积缩小了cosα倍。
然后，水的蒸发和水表面积缩小都会变缓，最后水位会趋于平衡。
Then, he said, evaporation would slow down as the surface area shrank, and the water level would stabilize.
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