Epimer
n. [化]差向(立体)异构体,差位(立体) 异构体
🗣️ 情景例句
Well, how do you like it so far?
好了， 到现在为止， 你们感觉怎么样？
How far is it from the shore of the Atlantic to the mountains?
从大西洋海岸到山脉有多远？
but where had it come from?
但它是从哪儿来的呢？