Epimer
n. [化]差向(立体)异构体,差位(立体) 异构体
🗣️ 情景例句
He is a college drop-out.
他从大学辍学半途而废。
Yesterday was such a beautiful day we decided to go for a drive.
昨天是如此美好的一天，我们决定开车出去。
It's a desk.
一张书桌。