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，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)系的基因可被辨識出來和分離開來的話，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。

　　難句類型：復(fù)雜修飾、插入語

　　解釋：主句比較簡單，而后面跟著的由and連接的兩個表示讓步的條件狀語從句就相對復(fù)雜，第一個從句是用一個修飾主語的定語從句that equip those plants to enter into a symbiosis with nitrogen fixers把主謂隔開;第二個從句則運用了插入語once they are found把主謂隔開。

　　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.