1、
Search, like the social networking sector dominated by Facebook, appears to be a natural monopoly.
就像Facebook所主宰的社交网络行业一样，搜索似乎也是一个自然垄断行业。
互联网摘选
2、
Spam has become rampant in the whole search engine sector of the problem.
垃圾信息的横行已经成为整个搜索引擎行业的通病.
网络文摘精选
