2017年托福考试阅读长难句分析解读
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It is significant that the earliest living things that built communities on these islands are examples of symbiosis, a phenomenon that depends up on the close cooperation of two or more forms of life and a principle that is very importantin island communities. (TPO9, 43)
community n. 社区，团体，社会，(动植物的)群落
symbiosis /smba'oss/ n. 共生。
It is significant that the earliest living things (that built communities on these islands) are examples of symbiosis, a phenomenon (that depends upon the close cooperation of two or more forms of life) and a principle (that is very important in island communities). (TPO9, 43)
托福阅读长难句100句分析：
修饰一：(that built communities on theseislands)，从句，修饰living things
中文：在这些岛上建立生物群落
修饰二：(a phenomenon and a principle)，同位语，修饰symbiosis，注意这里的a phenomenon和a principle被从句隔开了，注意这里的断句
修饰三：(that depends upon the close cooperation of two or more forms of life) ，从句，修饰a phenomenon
中文：依赖两种或两种以上的生物紧密合作
修饰四：(that is very important in island communities)从句，修饰aprinciple
中文：在岛上生物群落非常重要
托福阅读长难句100句参考翻译：
在这些岛上建立生物群落的最早的`生物以共生方式存在是非常重要的，共生是一种依赖两种或两种以上的生物紧密合作而生存的现象，也是在岛上生物群落非常重要的原则。
这个句子的主要修饰成分就是从句和同位语，大家务必想清楚，每一个修饰成分修饰的是什么，才能看清楚这个句子的结构。