即将离开知乎

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http://www.chinaxiv.org/abs/202002.00033%EF%BC%8C%E5%A4%A7%E5%AE%B6%E6%9C%89%E5%85%B4%E8%B6%A3%E5%8F%AF%E4%BB%A5%E8%87%AA%E8%A1%8C%E7%A0%94%E7%A9%B6%E3%80%82%E8%80%8C%E4%BB%8E%E7%BB%98%E5%88%B6%E7%9A%84%E5%9C%B0%E5%9B%BE%E5%9B%BE%E8%B0%B1%E4%B8%8A%E6%9D%A5%E7%9C%8B%EF%BC%8C%E6%88%91%E4%BB%AC%E7%9A%84%E7%97%85%E6%AF%92%E5%9F%BA%E5%9B%A0%E6%A0%B7%E6%9C%AC%E9%9D%9E%E5%B8%B8%E5%8D%95%E4%B8%80%E3%80%82%E6%84%9F%E5%8F%97%E4%B8%8B%EF%BC%8C%E4%B8%8B%E9%9D%A2%E8%BF%99%E4%B8%AA%E5%9B%BE%E5%9C%86%E5%9C%88%E9%87%8C%E7%9A%84%E4%B8%80%E4%B8%AA%E9%A2%9C%E8%89%B2%E5%B0%B1%E4%BB%A3%E8%A1%A8%E4%B8%80%E4%B8%AA%E7%BB%84%E3%80%82