a small discrete mass of solid or liquid matter that remains individually dispersed in gas or liquid emissions (usually considered to be an atmospheric pollutant) ガスか、液体の放出(通常大気汚染物質であると考えられる)の中で個々に分散し続ける固体か液体の物質の小さな個別の質量。
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【上位】 the tangible substance that goes into the makeup of a physical object; "coal is a hard black material"; "wheat is the stuff they use to make bread" 物の構成に費やされる、触れることのできる物質。
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【下位】 fine powdery material such as dry earth or pollen that can be blown about in the air; "the furniture was covered with dust" 乾いたや花粉など、大気中のあちこちを吹き飛ばされる細かな粒子状の物質。
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