Epimeric
差向异构体的
🗣️ 情景例句
Sorry, but she is with someone right now.
抱歉，她正在会客。
What would you say if I told you I couldn't go with you?
如果我告诉了你我不能和你一起去你将说什么？
At last I hung up the receiver.
我终于挂上了话筒。