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       1. 表转折：

　　but, however, yet, in fact, on the other hand;

　　A, but B: 否定A而肯定B，则A，B两部分内容是相反的。

　　例如：Computerized data storage and electronic mail were to have heralded thepaper less office. But, contrary to expectations, paper consumption throughoutthe world shows no sign of abating .

　　解释：paper less 表示负向，则but后no sign of abating 表示正向，所以abating是表示负向的词。

　　总结：此种方法有利于在不认识单词的前提下读懂句子意思，很有帮助，但一定要练习，而且要敏感。

　　练习：The marginal costs of generating electricity from nuclear energy may betiny, but , as the technology now stands, huge and uncertain costs are involvedin building the power stations, dealing with spent fuel, anddecommissioning.

　　2. 表让步：

　　(1)although：although A, B:尽管有A，B还是出现了(A，B互不影响)若A是正，那B就是负的。

　　例如：Although the world regards Asia as the focus of an economic andindustrial miracle, without adequate supplies of food, Lampe says, chaos couldeasily result in many countries.

　　解释：miracle奇迹，表正向,则but后的chaos是一个表负向的词。

　　(2)while：五个含义：

　　A. although：虽然，尽管

　　B. as long as：只要

　　C. whereas, but：表转折

　　D.when：当。。。的时候

　　E. n. 表一段时间

　　例如：While ducks offer many advantages over hens, they must be given greaterquality of food, especially if regular eggs are desired.

　　解释：原文在本段之前讲鸭子的好，在本段之后讲它的不好。

　　(3)Albeit：尽管，虽然

　　例如：Albeit true but not now.

　　3. 表并列：A and B

　　A...and B...

　　(1) 并列双方性质相同;

　　(2) 当A、B都比较复杂时，应该从最后一项找起，根据B的形式到前文找到A

　　例如：The modern city consists of monstrous edifices and of dark, narrowstreets full of petrol fumes and toxic gases, torn by the noise of the taxicabs,lorries and buses, and thronged ceaselessly by great crowds.

　　解释：此句话中共有四个and ,第一个and 并列of 结构，第二个and 并列fumes和toxic,第三个and并列taxicabs,lorries 和buses, 第四个and并列full of …, torn by… 和thronged…

　　4 表递进：没有转折的意思，后项承接上文。

　　A furthermore B

　　A moreover B

　　A besides B

　　A为正向，B 仍为正向。

　　5 表顺序或过程：

　　(1) first, then, next, later on, finally

　　(2) 1st, 2nd, 3rd…

　　(3) in the first place, in the second place…