Oxyparaffin
a. 含氧煤油的
🗣️ 情景例句
Be our guest.
请随意。
The day is long to him who knows not how to use it.
百无聊赖。
where chance discoveries play a much larger part than they do in physical and mechancal industries.
同物理和机械工业相比，化学工业中偶然发现的机会要多得多。