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https://blog.toright.com/posts/4521/%e8%a7%a3%e6%b1%ba-ssh-%e7%99%bb%e5%85%a5%e9%80%9f%e5%ba%a6%e6%85%a2%e7%9a%84%e5%95%8f%e9%a1%8c.html
解決 SSH 登入速度慢的問題