第二步是对已发布新闻内容进行聚合和索引，以使聚合器能更好地帮助用户找到已发布的新闻内容。

Step two is to aggregate and index published news content so that aggregators can better point their users to the published content.

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And he had a press conference, spoke about the increased use of cars, and the decreased amount of carpooling.

他开了一个新闻发布会，说道汽车使用量的增加，和拼车的减少。

麻省理工公开课 - 计算机科学及编程导论课程节选