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出门带了个刚买的便携式二氧化碳检测器，看看之前一直好奇的高铁车厢跟酒店房间的二氧化碳浓度到底多少。在家的时候数值变动不大以为不准，这下基本确认没问题了... (opens in new tab)

即刻App，享受探索、表达和创造

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