Polysubstituted
多取代的
🗣️ 情景例句
I'm a workaholic, so for me vacations are very boring.
我是个工作狂！度假对我来说太无聊了！
Enough! I don't want to hear it!
够了，不要再说了！
Before you leave the lab, make sure the electricity is turned off and the windows are shut.
你们离开实验室前，务必要关上电源，关好窗户。