| 单词 | sulphur trioxide | 
| 释义 | sulphur trioxidenoun a white corrosive substance existing in three crystalline forms of which the stable (alpha-) form is usually obtained as silky needles. It is produced by the oxidation of sulphur dioxide, and is used in the sulphonation of organic compounds. Formula: SO3Systematic name: sulphur(VI) oxide | 
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