第267句：

Their breakthrough, simply put, was that when their search engine crawled the Web, it did more than just look for word matches; it also tallied (统计) and ranked a host of other critical factors like how websiites link to one another.

他们的突破，简单地说，就是当用他们的搜索引擎在网页上搜索时，它并不单单是寻找匹配的词条，也对其他许多重要因素，例如网站如何彼此链接等进行统计和排名。

六级词汇讲解:

本句的主干是Their breakthrough...was that...。simply put为插入语。其中，that when their search engine...为表语从句，该从句中又包含when引导的时间状语从句，it did more than just...和it also tallied...则为该表语从句的并列主干。
simply put意为“简单而言，简而言之”，相当于simply speaking。如：
Simply speaking／Simply put,I hope you can take over this new project.
简单而言，我希望你能接手这个新项目。
crawl在句中可理解为“进行搜索”，其本义为“爬，缓缓爬行”。如：
A group ofprisoners crawled through a secret hole and escaped.
一群犯人匍匐通过一个秘洞之后逃走了。
a host of意为“许多，一大群”。如：
The country is faced with a host of compelling economic problems.
该国正面临许多引人注目的经济问题。