Plants Idea Genes Inserting Chromosomes Discrete Part Natural

意群训练： One such novel idea is that of inserting into the chromosomes of plants discrete genes that are not a part of the plants' natural constitution : specifically , the idea of inserting into nonleguminous plants the genes , if they can b e identified and isolated , that fit th e leguminous plants to be hosts for nitrogen-fixing bacteria . Hence , the intensified research on legumes .

标志： One such novel idea is that idea ［of insert ing /into the chromosomes of plants/ discrete genes (that are not a part of the plants' natural constitution)］：specifically, the idea ［of insert ing /into nonleguminous plants /the genes , if they can be identified and isolated , (that fit the leguminous plants to be hosts for nitrogen-fixing bacteria)］. Hence, there is the intensified research on legumes.

译文： 一个这样的全新的想法 ，是 把 （非此植物的自然组成部分的）不相关的基因 插入/到 植物的染色体中/；具体说来就是这么一个想法：把 一些使得豆科植物能够成为固氮菌的寄主的基因 （如果它们能够被找到并分离出来的话 ）插入/到 非豆科植物的基因中去/。因此才出现了对豆科植物的深入研究。

解释： 本句的难度以倒装为主，复杂为辅；然而二者相互借力，难度更大。而且本句中有两个省略，就更令读者头痛。

句子一开始的One such novel idea is that of之中的that of，是that idea of的省略形式。此处容易理解，后面开始变难。inserting into the chromosomes of plants discrete genes (that are not a part of the plants' natural constitution）看上去不舒服的原因，是作者在此用了一个倒装；正常语序应该是：inserting discrete genes (that are not a part of the plants' natural constitution) into the chromosomes of plants，即把非此植物的genes插入到该植物中。之所以倒装，是因为discrete genes加上复杂修饰的成分以后太长之故。同样，后面的the idea of inserting /into nonleguminous plants /the genes , if they can be identified and isolated , that fit the leguminous plants to be hosts for nitrogen-fixing bacteria 一句，正常的语序也是the idea of inserting the genes , if they can be identified and isolated , that fit the leguminous plants to be hosts for nitrogen-fixing bacteria /into nonleguminous plants /，即把 使得豆科植物成为固氮菌的寄主的基因 （如果它们能够被找到并分离出来的话 ）插入/到 非豆科植物的基因中去/。这一回，genes之后不但有定语从句的复杂修饰，而且在genes和that从句之间还有一个不短的插入语，增加了阅读难度。

最后的一句话，Hence, the intensified research on legumes，其实也不是一句话，只是一个词：research。作者省略了there is。其实此处即使看不清语法结构，作者的意思还是可以懂的。因此，笔者在前面强调的“如果可以看懂意思，不必去分析语法”，在实战的应用中有其意义：GRE和GMAT中很多表达其实不严格遵守语法，或者有考生不懂的语法，读者处心积虑去研究它们，不但没有实战的意义，而且还令读者徒增烦恼。

本句是GRE和GMAT考试中集各种语言现象之大成者，包括了几乎所有的难句类型。希望读者一定把这句话读熟；有心者最好能把它背熟，一定对提高你的阅读能力有好处。