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さんさんいおう 三酸化硫黄
Noun
1. sulfur trioxide (SO3)
Wikipedia definition
2. Sulfur trioxideSulfur trioxide (also spelled sulphur trioxide) is the chemical compound with the formula SO3. In the gaseous form, this species is a significant pollutant, being the primary agent in acid rain. It is prepared on massive scales as a precursor to sulfuric acid.
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