动词短语
中文翻译：平坦化
同义词：
['flatten', 'level']
例句：
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1.The car's tires were flattening off the road.
汽车的轮胎正在把路面压平。
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2. The engineer was flattening off the surface of the earth with his machine.
工程师正用他的机器把地球表面平整。
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3. The construction crew was flattening off the area for the new building.
建筑工人正在为新建筑物平整土地。