例句：
1.ugly： Life had sad, even ugly facts .人生是有一些悲哀的、甚至丑惡的事實。
2.unable ： I am unable to keep my engagement with you .我不能和你們朝夕相處。
3.uncertain：Faith is an uncertain relief . 信仰實在是一種解救,雖然看來有點渺茫。
4.uncle：Immy is uncle to all the kids who like to go boating with him. 那些喜歡和吉米一起乘船游玩的孩子都把他當叔叔
5.under:Do you think that everything is under control?你是否認為一切都在控制之中?
6.undergroundEarthquakes take place far underground .地震則發生在地球的極深處。