界，通过课堂演讲、课后讨论、会议、指定读物还有播客（pod casts）进行的 过量的信息检索也是消极的。
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pod-casts 听播客
There are the aforementioned 181 million blogs, but only 200, 000 pod casts in existence.
FORBES: Does it Matter That Google Conceded the Podcast Market to Apple?
In a blog post (he he) Google announced it was discontinuing Google Listen, an application it launched in 2009 to search for and play pod casts.
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