2018考研英語長難句分析指導(dǎo)（十六）

　　The presumption on which human cloning rests is that all these cells，though now specialized，still contain exact copies of the original set of genetic instructions needed to make an entire individual and can do so if a way is found to switch them back on.

　　結(jié)構(gòu)分析:句子的框架是The presumption is that all these cells…contain genetic instructions…and can do so…。其中介詞on加which引導(dǎo)定語從句修飾主語the presumption; that從句為表語從句;此表語從句中contain和can do并列做all these cells的謂語;表語從句中又插入一個(gè)though引導(dǎo)的省略了主語all these cells的讓步狀語從句，補(bǔ)充完整為though these cells are now specialized; needed to make an entire individual為過去分詞短語做genetic instructions的后置定語;并列謂語can do so又有if條件句修飾。rest on意為“依賴”。為避免重復(fù)do so代替前文提到的make an entire individual。

　　譯文：人類克隆賴以存在的假定是:雖然所有的細(xì)胞現(xiàn)已全部特化，但卻仍然包含有發(fā)育為完整個(gè)體所需的與母體完全一致的全部遺傳指令;如果能找到一個(gè)方法使失去作用的部分恢復(fù)作用，這些細(xì)胞就能發(fā)育成為完整的個(gè)體。