Allylacetone
[有化]烯丙基丙酮
??? 情景例句
Good for you.
我真為你高興。
Friends are lost by calling often and calling seldom.
交往過密過疏，都會(huì)失去朋友。
As it is only six feet across, it is barely noticeable.
僅6英尺寬，很難被發(fā)現(xiàn)。