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单词 particulate matter
释义 particulate mattern.(名词)abbr. PM【缩写】
  1. Material suspended in the air in the form of minute solid particles or liquid droplets, especially when considered as an atmospheric pollutant.粒状物质:悬浮于空气中以固体或液体微分子状存在的物质,尤指大气污染物
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