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出典:Wiktionary
sulfur trioxide (uncountable)
出典:Wikipedia
出典:『Wikipedia』 (2011/06/02 12:59 UTC 版)
Sulfur 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.
Sulfur trioxide