1.段内并列

　　分析某事物时，用此句型说明其主要原因或者多方面原因

　　例如：Why…? For one thing …For another …There are many reasons for this problem. First /For one thing …Second / For another …Third/ Still another …

　　2.段内延伸

　　例如：In involves some serious consequence for …

　　3.段内对比

　　(1)肯定其中一个

　　The benefits gained from B are much greater than that of A.

　　(2)二者有共同点

　　A and B have several things in common .They are similar in that…

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