即将离开知乎
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http://www.nytimes.com/2012/09/23/magazine/how-silent-spring-ignited-the-environmental-movement.html
您即将离开知乎,请注意您的帐号和财产安全。
http://www.nytimes.com/2012/09/23/magazine/how-silent-spring-ignited-the-environmental-movement.html