21.at present 目前，眼下

　　At present, I don't want to go aboard. 眼下我不想出國。

　　He is at present serving his life sentence. 他眼下在服終生監(jiān)禁。

　　22.attribute to 把……歸因于

　　He attributed his success to good luck. 他把成功歸因于運氣。

　　Air pollution has been partly attributed to cars. 空氣污染部分原因是由于汽車的使用。

　　23. aware of 明白，意識到

　　I am not aware of his intentions. 我不明白他的意圖。

　　I was not aware of my danger. 我沒意識到危險。

　　24.base on/upon 以……為基礎(chǔ)，基于

　　The novel is based on the historical facts. 這部小說是根據(jù)歷史題材寫成的。

　　The belief is based upon practical experience. 這信仰來源于實踐經(jīng)驗。

　　25.be able to 能，會

　　Since his accident, he hasn't been able to leave the house. 他自從出了事故以來就沒能離開這房子。

　　The frog is able to jump 3 meters at one time.這只青蛙一次能跳三米遠(yuǎn)。

　　26.be absorbed in 全神貫注于，專心于

　　She was absorbed in the book. 他全神貫注地讀書。

　　He was so absorbed in his work that he rarely noticed what happened around him.他全神貫注地工作，很少注意到周圍發(fā)生了什么。

　　27.be composed of 由……組成

　　The class was evenly composed of boys and girls. 這班級由男生與女生平均組成。

　　What is water composed of? 水是由什么組成的?

　　28.be concerned with 關(guān)于，與……有關(guān)

　　This book is concerned with computer technology. 這本書是關(guān)于計算機技術(shù)的。

　　He is always concerned with state affairs. 他總是關(guān)心國家大事。

　　29. be fit for 適合

　　The book is fit for children.這本書適合孩子。

　　The houses are now fit for human habitation. 這些房子適合人類居住。

　　30.be/go on a diet 節(jié)食

　　I mustn't have chocolate. I am on a diet. 我不能吃巧克力，我在節(jié)食。

　　Going on a diet is not the best way to reduce weight. 節(jié)食不是減肥的最佳辦法。

　　31.be related to 與……有關(guān)，涉及

　　This article is related to the international situation. 這篇文章講的是國際形勢。

　　Painting is related to art. 繪畫與藝術(shù)有關(guān)。

　　32.be/get tired of 對……感到厭倦

　　I am tired of exams. 我厭倦了考試。

　　I am tired of eating the same food every day. 我厭煩了每天吃同樣的食物。

　　33. be/get used to 習(xí)慣于

　　We are used to the cold weather here. 我們適應(yīng)了這里的寒冷天氣。

　　34.bear/keep…in mind 牢記在心

　　Bear in mind what I am saying. 記住我說的。

　　Please bear in mind the instructions the doctor has given you. 記住醫(yī)生給你的指示。

　　35.because of 因為

　　Because of his laziness, he failed the exam again. 因為懶惰，他考試再次不及格。

　　Because of his bad leg, he could not walk as fast as others. 由于他的殘腿，他不能與別人走一樣的快。

　　36.begin/start with 以……開始

　　The first word of a sentence should begin with a capital letter.句子的首字母應(yīng)大寫。

　　Knowledge begins with practice. 理論來源于實踐。

　　37.before long 不久，很快

　　The storm will be over before long. 風(fēng)暴很快就會過去。

　　The book will be published before long. 這本書不久之后就出版。

　　38.believe in 信任，相信

　　I don't believe in ghosts. 我不信鬼。

　　Marxism believes in the primacy of matter. 馬克思主義相信物質(zhì)第一性。

　　39.belong to 屬于

　　The land belongs to a big family. 這片土地屬于一個大家庭。

　　The future belongs to a big family. 未來屬于年輕的一代。

　　40.benefit from 從……獲益

　　I benefited a lot from his advice. 我從他的建議中受益非淺。

　　He will benefit from the new way of doing business. 他會從新的生意之道中獲益匪淺。