(http://www.ncbi.nlm.nih.gov/sites/entrez?cmd=Retrieve&db=PubMed&list_uids=10706169&dopt=AbstractPlus)
Halpern CT, Joyner K, Udry JR, Suchindran C.
University of North Carolina at Chapel Hill, USA.

PURPOSE: To examine the relationship between an intelligence measure and a wide spectrum of partnered sexual activity ranging from holding hands to sexual intercourse among adolescents. 阅读全文 »

本文先引用几句话：

1.“确解用户之意，切返用户之需。”
2.“门户网站都想着是怎样省钱，而不是怎样花钱来买技术。”
3.“搜索引擎不是人人都能做的领域，进入的门槛比较高。”
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