Pentabromination
五溴化反应
🗣️ 情景例句
You'd better not make Harry any more nervous than he is.
你最好别让Harry更加紧张了。
You must not pledge your own health.
切不可把健康作孤注一掷。
Before they were replaced by steamships,
在蒸汽船取代帆船之前。