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Unless they succeed，the yield gains of the Green Revolution will be largely lost even if the genes in legumes that equip those plants to enter　into a symbiosis with nitrogen fixers are identified and isolated，and even if　the transfer of those gene complexes，once they are found， becomes possible.

=Unless they succeed/，the yield gains of the Green Revolution/ will be largely lost/ even if the genes in legumes/ that equip those plants to enter into a symbiosis with nitrogen fixers/ are identified and isolated/，and even if　the transfer of those gene complexes/，once they are found， becomes possible.

除非他们成功/，否则产量收入绿色革命的/将在很大程度上损失/，即使豆科植物中的基因/它为植物创造条件进入共生系统和固氮细菌（共生）/可被辨识出来和分离开来/，即使转移这些基因综合体，一旦被发现之后，成为可能。

It is one of nature’s great ironies that the availability of nitrogen in the soil frequently sets an upper limit on plant growth even though the plants’ leaves　are bathed in a sea of nitrogen gas.wｗw.ExamＷ.CoM

=It is one of nature’s great ironies/ that the availability of nitrogen/ in the soil/ frequently sets an upper limit on plant growth/ even though the plants’ leaves　are bathed in a sea of nitrogen gas.

自然界最大的矛盾之一/就是氮供给/土壤中的/通常限定了一个上限植物生长的/，尽管植物的叶子沉浸在一片氮气的海洋中。

延伸阅读：

托福阅读备考技巧——做题原则

托福阅读备考技巧——词汇如何过关

托福阅读考试的题材范围

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