Piperylone
[化] 哌立酮; 哌吡唑酮
??? 情景例句
When will this time draft fall due?
期票什么時(shí)候到期？
Men may meet but mountains never.
人生何處不相逢。
It was the last day of the year and a large crowd of people had gathered under the Town Hall clock.
那是一年的最后一天，一大群人聚集在市政廳的大鐘下面。