名词
中文翻译：人口密度
同义词：
['density of population', 'population density']
例句：
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1.The city's population density is high, making it difficult for new residents to settle.
这个城市的人口密度很高，这使得新居民很难定居。
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2. The increase in population density has led to an increase in housing prices.
人口密度的增加导致了房价的上涨。
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3. The study found that the population density had a significant impact on the environment.
研究发现，人口密度对环境有显著影响。