Alkylammonium
烷基铵
🗣️ 情景例句
Is this the bus that goes by the mall?
这班公共汽车经过商业街吗？
I would like to check her sewing machine.
我要去检查她的缝纫机。
Half an hour later ,she woke up and began to cry.
半小时后她醒了，哭了起来。