Ketosubstrate
酮基底物
🗣️ 情景例句
I'm afraid I didn't get on very well in the exam.
我这次考试恐怕不太顺利。
I will come back with him if he asks me.
我会和他走回来，假如他要求我的话。
I'm tired. I'm going home now. Goodnight!
我累了。我要睡觉了。晚安！