@jrbedford @larmbrust You need zillions of air changes for near field exposure to not matter. It's almost never, if ever, feasible. Even on airplanes people in close proximity get routinely infected (particularly on longer flights).
@jrbedford@larmbrust你需要无数次换气，才能近场暴露在无物质环境中。这几乎永远都不可行。即使是在飞机上，近距离接触的人也会经常受到感染（尤其是在长途飞行中）。