原句案例：

　　It seems likely that Teotihuacan's natural resources, along with the city elite's ability to recognize their potential, gave the city a competitive edge over its neighbors.

　　词汇讲解：

　　potential作名词，表示“潜力，潜能”，比如：China is a huge market with great potential for the whole world. 中国对于全世界来说是一个潜力巨大的市场。本句中the ability to recognize their potential表示“认识这些资源潜能的能力”。

　　edge作名词，表示“边缘;优势”，本句中give ... a competitive edge over ... 指的是“比起……，赋予……一种竞争优势”，比如：Having a good command of English gives her a competitive edge over her colleagues. 比起她的同事，娴熟的英语能力让她有竞争优势。

　　句子分析：

　　It(形式主语)seems(谓语)likely(表语)that Teotihuacan’s natural resources, [along with the city elite's ability to recognize their potential](插入语), gave the city a competitive edge over its neighbors(主语从句).

　　本句中it为形式主语，真正的主语是that引导的名词性从句，也叫主语从句。主语从句的谓语动词是gave，这个词组gave sth. a competitive edge，意思是“赋予……一种竞争优势”。而本句中along with...则是插入语，可以留到最后来读。

　　参考翻译：

　　很可能的是特奥蒂瓦坎的自然资源和精英们认识这些资源潜能的能力，赋予了这座城市能与其邻居们竞争的优势。

　　以上就是托福阅读中长难句的训练分析介绍，希望大家能够学到有效的训练和提升方法，让自己更为轻松地面对长难句得到高分。