我的理解：如果有用，很有用，中國在每個城市的地鐵口設置一些免費喝的機器就可以了，成本一定比封城一檢再檢低得多

來源: 說時依舊於 2022-02-25 08:56:23 [舊帖] [給我悄悄話] 本文已被閱讀：次

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