托福阅读高难度文章长难句实例解析：地理隔离影响物种发展

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想要看懂托福阅读长难句，考生除了拥有牢固的英语语法基础外，还需要积累大量的实际分析和应对长难句的经验。下面小编就来为大家带来一些托福精选资料教材中的长难句案例分析，帮助考生提升理解长难句的能力，更好地解答阅读难题。

托福阅读100个长难句实例分析

原句案例：

Geographic isolation creates opportunities for new species to develop, but it does not necessarily lead to new species because speciation occurs only when the gene pool undergoes enough changes to establish reproductive barriers between the isolated population and its parent population.

词汇解释：

isolation: one group, person, or thing is separate from others.

speciation: speciation is the evolutionary process by which new biological species arise.

gene pool: the gene pool is the set of all genes, or genetic information, in any population, usually of a particular species.

结构分析：

并列复合句

句1 Geographic isolation creates opportunities for new species to develop，

句2 but it does not necessarily lead to new species because speciation occurs only when the gene pool undergoes enough changes to establish reproductive barriers between the isolated population and its parent population.

*其中句2含有because引导的原因状从和when引导的时间状从。

句子分析：

句1中

geograhic isolation 主语， creates 谓语，opportunities 宾语， for new species 介词结构作定语，to develop, 目的状语。本部分意思：地理隔离创造了新物种发展的机会。

句子2

主句部分 ：but it does not necessarily lead to new species

it 主语，指代geographic isolation， does not necessarily lead：谓语部分， to new species：宾语。本部分意思：但它不一定会导致新物种

原因状语从句：because speciation occurs

speciation是主语，occurs 谓语。

本部分意思：因为新物种的出现(产生)。

时间状语从句：when the gene pool undergoes enough changes to establish reproductive barriers between the isolated population and its parent population.

the gene pool，主语;undergoes，作谓语;enough changes 宾语。

to establish 状语。其中，reproductive barriers是establish的宾语。

between the isolated population and its parent population,介词结构作定语，说明是isolated population 和 its population之间的障碍。

本部分意思：因为只有当基因库产生足够的变化，使得分割种群与其总群之间产生繁殖障碍时。

参考翻译：

地理隔离创造了新物种发展的机会，但它不一定会导致新物种，因为只有当基因库产生足够的变化，使得分割种群与其总群之间产生繁殖障碍时才会产生新的物种。

以上就是托福阅读中长难句的训练分析介绍，希望大家能够学到有效的训练和提升方法，让自己更为轻松地面对长难句得到高分。

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