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https://hkplg.org/2017/06/15/%e8%8b%b1%e6%96%87%e6%b0%b4%e5%b9%b3%e4%b8%8b%e9%99%8d%e7%9a%84%e8%ad%a6%e8%99%9f/
英文水平下降的警號