[化] 三氧化硫

sulfur trioxide的用法和样例：

例句

The new toluene sulforation tcehnology and the structure off the jetting loop sulfonation reactors of the gaseous sulfur trioxide were presented.主要介绍了气相三氧化硫甲苯磺化新工艺及喷射环流磺化反应器的结构。
The direct reaction between sulphur dioxide and oxygen to give sulphur trioxide is slow and requires a catalyst.二氧化硫与氧气直接反应生成三氧化硫是很慢的，且需要催化剂。

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