Un-not
The audience was breathless with anxiety during the daring tightrope act,though the acrobats themselves performed with seeming unconcern for their own safety.
在胆大的走钢索表演中，观众都因焦虑而摒住气息，虽然那些走钢索的人表现得毫不在意他们自己的安全。
If you think I can get Mr.Black to hire you because he is my cousin,let me undeceive you.I have no influence with him.
如果你认为我能使布莱克先生雇用2你，是因为他是我叔叔的话，让我老实告诉你，我对他没有影响力。
The unsportsmanlike noises of the fans so unnerved our star player that he missed two foul shots in a row.
没运动风度的球迷发出的闹声，使我们的明星球员镇定，结果接连两次罚球都没进。
The previous secretary had mixed up the files so badly that it took my sister about a week to unscramble them.
先前的秘书把档案混得很乱，使我姐姐花了大约一星期才把它们整理好。
When mutinous sailors were put in irons in the olden days,nobody was allowed to unshackle them.
昔日当眷恋的水兵加以镣铐时，没有人被允许除去他们的枷锁。
Though an abridged dictionary is convenient to use,it contains far fewer definitions than an unabridged dictionary.
虽然一本摘要的词典方便使用，但它所含字词的定义却比完整的词典少得多。
Don’t ask the mother of a contestant to serve as a judge because it may be hard for her to remain unbiased.
别要选手的母亲作裁判，因为很难要她保持公平。
Many teenagers have an unquenchable thirst for adventure stories;they read one after another.
许多十几岁的青少年对于冒险故事有一种难以抵制的渴望，他们一本接一本的读。
An unwary pedestrian is much more likely to be struck by a car than one who looks both ways and crosses with the light.
一个不小心的行人比一个过路看看来往车与遵守交通灯号的人更有可能被车撞到。
On its way through the dense jungle,the patrol had to be constantly wary of enemy soldiers concealed in the underbrush.
在穿过浓密丛林的路上，巡逻队必须不断提防着隐藏在矮树丛中的敌军。
Most undergraduates take four years to earn a degree,but some achieve it sooner by attending summer sessions.
大多数的大学生须花四年获得学位，但有一些学生参加时期班就可更快获得。
If too little is deducted from Dad’s weekly wages for income tax,it results in an underpayment at the end of the year.
如果父亲所得税的减免额太少，今年年底就会发生不够缴付的结果。
Among the undersigned in the petition to the governor were some of the most prominent persons in the state.
向政府提出请愿书的一些署名者中，有一些是国内最杰出的人士。
Frank’s remark that he was “slightly bruised”in the accident is an understatement;he suffered two fractured ribs.
法兰克说他在车祸中轻微瘀伤是轻描淡写，其实他两根肋骨折断。
While the star is recuperating from her illness,her role will be played by her understudy.
当明星正在休养恢复健康时，她的角色由修补演员代替。
When we take notes,our teacher wants us to underscore items that are especially important.
当我们记重点时，我们老师要我们在特别重要的项目下画线。
When discount houses tried to undersell department stores,the latter reduced prices too,and adopted the slogan”We will not be undersold.”
当廉价商品尝试将售价低于百货公司时，百货公司也降了价，同时延用了他们的口号，别人不会比我们便宜。
Our country has spent billions of dollars to help the underdeveloped nations improve their standard of living.
我们国家已花了好几十亿元去帮助低开发国家，改善他们的生活水平。
The underprivileged child from the crowded slum tenement has many more problems to overcome than the child from the middle-class home.
来自拥护贫民窟中的穷孩子，比中产阶级的孩子有更多的问题要克服。