Epimerization
差向[立体]异构(作用)
🗣️ 情景例句
My visa is multi-entry; it allows me to exit the country and then re-enter, as ofter as I like.
我的签证是往返签证，我可以随便进出这个国家。
Hello, Tom, what's happening?
你好，汤姆，怎么啦？
Is dinner ready, Carol?
卡罗尔，饭好了吗？