Ethinylation
乙炔化
🗣️ 情景例句
Lots to be thankful for.
要感谢的事很多。
How long have you studied English?
你学英语多久了？
We don't like the same colours, either.On our birthday, we often get the same presents.
我们对颜色的喜爱也不一样。每逢过生日，我们经常得到一样的礼物。