Epimer
n. [化]差向(立體)異構體,差位(立體) 異構體
??? 情景例句
I keep thinking about the dog -- about Gemma,
我一直在想那只狗 Gemma，
I'm too thirty.
我太渴。
Of course. Good luck. Have a good trip.
一定。祝你好運。旅途愉快！