Piperidyl
[化] 哌啶基; 2-,3-或4-哌啶基; 氮雜環己基
??? 情景例句
Leave well enough alone.
得過且過，見好就收。
You make the failure complete when you stop strying.
不再努力之時，就是完全失敗之日。
It's a small world.
世界真小。