四六级考场上分秒必争，气氛紧张，尤其是到最后作文写作部分时，更是时间紧迫，无暇多思。但是只要大家有针对性地进行四级考试备考训练和准备，短期内还是能收到成效的。环球博海四六级小编特整理了2014年6月英语四级作文考试必备知识训练(7)，希望能对2014年6月份的广大考生有所帮助。

　　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.

 　以上是小编为2014年6月份备考的广大考生准备四级考试写作必备知识训练，大学英语四六级改革无论如何变化，万变不离其宗，只要考生认真研究历年真题的变化，总结归纳其命题规律及发展趋势，找到科学有效的备考方法，一定能够赢得考试的最终胜利!

  环球博海四六级栏目针对广大考生学习情况特推出网络课程、四六级寒假班以及6000词汇突破班等，以及环球博海四六级官方频道的YY讲堂，权威名师悉心指导，让你的学习打破常规壁垒、突飞猛进。

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