缩写中文翻译
中文翻译：Unknown
同义词：
['ppm', 'parts per million']
例句：
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1. The water in the bottle has a ppm of 500.
瓶子里的水有500 ppm。
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2. The soil test showed a ppm of 300.
土壤测试显示ppm值为300。
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3. The pollution levels in this area are well above the ppm limit.
该地区的污染水平远高于ppm限制。