名词
中文翻译：纯净下降同义词
同义词：
['purity decline', 'purity fall', 'purity decrease']
例句：
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1. The purity of the water has dropped significantly due to pollution.
由于污染，水的纯净度已经大幅下降。
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2. The purity drop in the air quality index is alarming.
空气质量指数的纯净度下降令人担忧。
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3. The purity drop in the water supply has led to a shortage of drinking water.
供水中的纯净度下降导致了饮用水短缺。