城市面积并非指我国行政单位的“市”，而是指地处交通方便环境的、且覆盖有一定面积的人群和房屋的密集结合体。
双语例句原声例句
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扩大城市面积危害着野生物。
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他们凿建了三条巨大的运河，使得城市面积扩大了四倍。
They build these three large canals and this expands the area of the city by four times.
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夏延城市面积小也有帮助；路上来往的车辆更少，机动车是PM2.5的主要来源。
Cheyenne's small size may help; fewer cars travel the roads, and vehicles are a key source of PM 2.5 (and ozone).
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They build these three large canals and this expands the area of the city by four times.
他们凿建了三条巨大的运河,使得城市面积扩大了四倍
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