Levulinate
乙酰丙酸
??? 情景例句
You have excelled youself this time, well done!
這一次你超水平發揮了，干得不錯！
As a senior, Peter is writing his thesis.
作為大學四年級學生，彼得正在寫畢業論文。
Yes, I'm sorry about that.
是的，那件事我很抱歉。