Epimeric
差向异构体的
🗣️ 情景例句
As a matter of fact,
事实上，
Is there any chance of my borrowing your typewriter?
能不能借用一下你的打字机？
They then knew that they had discovered the cause of the fire.
这时调查人员知道他们找到了发生火灾的原因了。