即将离开知乎
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http://www.straightdope.com/columns/read/875/why-flies-rub-their-hands-together-the-untold-story/
您即将离开知乎,请注意您的帐号和财产安全。
http://www.straightdope.com/columns/read/875/why-flies-rub-their-hands-together-the-untold-story/