Pentabromination
五溴化反应
🗣️ 情景例句
I'm totally exhausted by the time I get home.
等我回到家，已经累得精疲力竭了。
If it hadn't been for your help, we would never have finished it.
如果没有你的帮助，我们永远完不成任务。
Sit down here.
坐在这儿吧。