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请教下，对于一种语言，如何称之为精通？
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程序员 - @superXiong - 最近由于接手某新项目，需要用到 ruby 的 ROR 框架，负责人是业界大牛，一个劲给我讲着 ROR 的好处，最后说：“虽然这个语言现在不是很流行，但是面向程序员很友好，如果你能精通，对其他语言的
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