Epimer
n. [化]差向(立体)异构体,差位(立体) 异构体
🗣️ 情景例句
Don't be so grumpy.
别总这么爱抱怨。
He is far too qualified for such a menial position.
他做那样卑贱的工作，未免太可惜了。
and as the number of stars in the universe is so vast,
因为宇宙中恒星的数目极其庞大，