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http://www.raywenderlich.com/zh-hans/22281/%E5%A6%82%E4%BD%95%E4%BD%BF%E7%94%A8box2d%E5%92%8Ccocos2d%E5%88%B6%E4%BD%9C%E4%B8%80%E6%AC%BE%E5%83%8Ffruit-ninja%E4%B8%80%E6%A0%B7%E7%9A%84%E6%B8%B8%E6%88%8F-%E7%AC%AC1%E9%83%A8%E5%88%86