47. Unless they succeed，theyield gains of the Green Revolution will be largely lost even if the genes inlegumes that equip those plants to enterinto a symbiosis with nitrogen fixersare identified and isolated，and even if the transfer of those gene complexes，once they are found，becomes possible.

　　(4) 除非他們能取得成功，不然的話(huà)，綠色革命的產(chǎn)量收益將在很大程度上損失殆盡，即使豆科植物中使這些植物有條件進(jìn)入到與固氮細(xì)菌共生關(guān)系的基因可被辨識(shí)出來(lái)和分離開(kāi)來(lái)的話(huà)，且即使這些基因綜合體(gene complex)，一旦被發(fā)現(xiàn)之后，其移植得以成為可能的話(huà)。

　　難句類(lèi)型：復(fù)雜修飾、插入語(yǔ)

　　解釋?zhuān)褐骶浔容^簡(jiǎn)單，而后面跟著的由and連接的兩個(gè)表示讓步的條件狀語(yǔ)從句就相對(duì)復(fù)雜，第一個(gè)從句是用一個(gè)修飾主語(yǔ)的定語(yǔ)從句that equip those plants to enter into a symbiosis with nitrogen fixers把主謂隔開(kāi);第二個(gè)從句則運(yùn)用了插入語(yǔ)once they are found把主謂隔開(kāi)。

　　意群訓(xùn)練：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.