四六级考试部分，写作永远是同学们最为头疼的部分，而且占得分值也比较大，这就要求同学们在英语学习中注重加强自身的写作实力，对写作这部分有自己的理解和把握，持之以恒的练习，才能在不断前进和发展的四六级考试中游刃有余，获得满意的分数。环球博海四六级网小编整理了2013年英语四级作文提分技巧之同位结构，以期能够帮助到大家!

　　同位结构

　　同位语指用于再定义相邻的名词(或词组)的名词(或词组)。

　　例 Nature was addressed for the first time in a universal and international language, the precise and quantitative idiom of mathematics, a tongue which every man and woman, irrespective of color, creed or race, can use and master if given the proper training.

　　注: "the precise and quantitative idiom of mathematics" 和 "a tongue which every man and woman can use and master" 是同位语。

　　Awkward: Today, transistors and other solid state devices, such as personal computers, cellular telephones, and precision controls, to name a few, are the foundation of industries unknown a few decades ago.

　　Better: Today, transistors and other solid state devices are the foundation of industries unknown a few decades ago - personal computers, cellular telephones, and precision controls, to name a few.

　　(注意: industries unknown a few decades ago = personal computers, cellular telephones, and precision controls)

　　Awkward: Coolidge was a taciturn, morose New England farmer who did not seem to have apparent talents, but, he appeared to the country to symbolize such old American virtues as frugality, honesty, hard work and religious faith.

　　Better: A taciturn, morose New England farmer of no apparent talents, Coolidge nevertheless appeared to the country as a symbol of old American virtues: frugality, honesty, hard work, and religious faith.

　　Loose: Biotechnology is defined as the use of a natural biological system to produce a product or to achieve an end desired by human beings. The subject is not new.

　　Better: Biotechnology, the use of a natural biological system to produce a product or to achieve an end desired by human beings, is not new.

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