每周一个长难句，手把手教程（第25期）

小白老师说：最想去的地方，怎能在半路返航。每周一个长难句，踏踏实实吃透语法、扩充单词、提升能力。

来看今天的长难句：

They predict that a complete understanding of the human genetic code would provide untold benefits for humanity，for example，those abilities to diagnose, cure, and eventually prevent many diseases caused by faulty genes.

步骤一：找主干

这是一个宾语从句，主干为：They predict that … 他们预测说…

步骤二：拆分句子

为了便于分析，帮助大家理解，小白老师把这个句子切分了一下，并标上了序号。

①They predict ②that a complete understanding of the human genetic code would provide untold benefits for humanity, for example, those abilities to diagnose, cure, and eventually prevent many diseases caused by faulty genes.

① They predict … They 是整个句子的主语，predict 是谓语

② that 直至句末是一个由 that …引导的宾语从句，在该从句中：

• a complete understanding of the human genetic code 是主语
• would provide 是谓语
• untold benefits for humanity 是宾语
• for example 是插入语
• those abilities to diagnose … faulty genes 为前文untold benefits for humanity 的同位语
• to diagnose, cure, and eventually prevent many diseases caused by faulty genes 动词不定式短语作定语，修饰 abilities
• caused by faulty genes 动词的过去分词短语作后置定语，修饰 diseases

步骤三：查生词

1. genetic [dʒəˈnetɪk] adj. 基因的；遗传学的

genetic and environmental factors 遗传和环境因素

genetic abnormalities 基因异常

2. untold [ˌʌnˈtəʊld] adj. 不计其数的；难以估量的

An Olympic gold medal can lead to untold riches for an athlete.

一枚奥运金牌能给运动员带来无尽的财富。

3. faulty [ˈfɔːlti] adj. 有缺陷的

This machine is guaranteed for a year against faulty workmanship.

这种机器如有工艺缺陷可保修一年。

参考译文：

他们预计，对人体基因编码的全面认识将给人类带来无法估量的好处，例如，使人类能够诊断、治疗并最终预防由基因缺陷造成的很多疾病。