Acetylacetone
乙酰丙酮, 戊间二酮
🗣️ 情景例句
that I never could have done this book
我不可能完成这本书
My cousin is a member of a riding club, He seems riding.
我的表兄是一个骑马俱乐部成员，他似乎很喜欢骑马。
Why does aperson standing in a bus or train tend to fall when a sudden start is made?
一个人站在公共汽车或火车上，当车突然开动时，他为什么会倾倒呢？