动词短语
中文翻译：密度减少
同义词：
['decrease in density']
例句：
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1.As the temperature drops, the density of the air increases.
随着温度下降，空气的密度增加。
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2.The amount of water in the lake has decreased significantly.
湖中的水量显著减少。
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3.The company's profits have been decreasing for several years.
该公司的利润已经连续几年下降。