Rating systems are hardly a new idea - many online communities use badges and other methods for rewarding helpful participation.
评价系统并不是什么新概念，很多网站通过徽章和其它方法对用户贡献进行回报。
Rating systems are hardly a new idea - many online communities use badges and other methods for rewarding helpful participation.
评价系统并不是什么新概念，很多网站通过徽章和其它方法对用户贡献进行回报。
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