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知乎，让每一次点击都充满意义 —— 欢迎来到知乎，发现问题背后的世界。previous - belonging to some prior time; "erstwhile Buddy"; "our former glory"; "the the moment capital of your point out"; "her quondam lover"知乎，让每一次点击都充满意义 —— 欢迎来到知乎，发现问题背后的世界。Refer