@MCCCANM Relative to occupancy (important qualifier!), ventilation on planes is fair to poor, and often even worse on the ground. Always difficult to link individual cases, but the conditions are certainly conducive to many pax and crew infections on board.
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@相对于占用率（重要限定符！），飞机上的通风相当差，在地面上往往更差。通常很难将个别病例联系起来，但条件肯定会导致船上许多乘客和机组人员感染。
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