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https://blog.mlchen.org/212/%e6%a8%a1%e6%93%ac%e5%9c%a8%e5%a4%a7%e9%99%b8%e5%9c%b0%e5%8d%80%e7%9a%84%e4%b8%8a%e7%b6%b2%e9%99%90%e5%88%b6%e7%92%b0%e5%a2%83
模擬在大陸地區的上網限制環境