Stop to extend now support valence certificate, land Yahoo knowledge hall to have the 20 yuan ticket that support price every week before, did not have now.
现在停止发放抵价券了，以前每周登陆一次雅虎知识堂就有20元的抵价券，现在没有了。
ITalki: a language exchange with a Yahoo! Answers-style QnA site, and a wiki-based public knowledge base for 10 different languages.
iTalki：语言交流网站，并附带一个如雅虎知识堂之类的问答模块及基于wiki的十个语言版本的公共知识库。
ITalki: a language exchange with a Yahoo! Answers-style QnA site, and a wiki-based public knowledge base for 10 different languages.
iTalki：语言交流网站，并附带一个如雅虎知识堂之类的问答模块及基于wiki的十个语言版本的公共知识库。
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