1.ubiquitous：a. 普遍存在的
We were plagued by the ubiquitous mosquito.我们被无处不在的蚊子所困扰。
2.ulcer：n. 溃疡
3.ulterior：a. 1.隐秘的2.别有用心的
She definitely had an ulterior motive in offering to help.她主动提出帮忙, 肯定有不可告人的动机。
4.unabashed：a.不害羞的
His trousers fell down but he appeared quite unabashed.他的裤子掉了下来, 可他却显得满不在乎。
5.unassuming：a. 不爱表现的，谦虚的
Despite his position, he has an unassuming personality.虽然有地位, 但他为人谦逊。
6.unbecoming：a. 1.不适合的2.不得体的
Although not illegal his conduct was unbecoming for a lawyer.他的行为虽不违法,却与其律师身份不相称。
7.uncanny：a.异乎寻常的，出乎意料的
His powers of observation were uncanny.他的观察能力非常惊人。
8.unceremonious：a. 不拘礼节的
On the stage, you could make an unceremonious presentation在舞台上，你可以随意地表现。
9.uncouth：a. 粗野的，无教养的
To a Japanese, spilling anything is uncouth.对日本人来说, 泼溅任何东西都是不文明的。
10.underachieve：v. 成绩不理想
The case for choice is appealing:by allowing parents to send their children to any school in any neighborhood, underachieving schools will be forced to shape up.任意选择[学校]的主意很讨好：允许父母送子女到任何住宅区里的任何学校，可以逼迫成绩落后的学校改进。
（责任编辑：liushengbao）
