現買現賣：droplets（飛沫） + aerosols（氣溶膠） + 物體表麵。飛沫傳播一般不超過6尺氣溶膠遠些。

Larger, heavier respiratory droplets can travel up to 6 feet, but then they fall to the ground. Smaller, aerosolized particles, however, can get caught in air flows and move throughout a space, infecting people at further distances.

"It's really the size of the droplet nuclei that defines an aerosol-borne infection versus a droplet-borne infection," said Monica Gandhi, MD, MPH, an infectious disease expert at the University of California San Francisco. She added that in recognizing the airborne nature of COVID-19, we acknowledge that "it's most effectively transmitted in closed, indoor spaces, and that ventilation is one of the most important things to mitigate the virus."

When an infected individual emits aerosols, they are more likely to spread disease in poorly ventilated, indoor spaces. Outdoors, however, the virus can disperse more easily. Several epidemiological studies have demonstrated the potential for COVID-19 aerosols to infect others indoors.

所有跟帖： 

• 我一直說抗疫是工程，不是科學，但是很多人不這麽認為。等弄明白了，不知道已經死了多少人了。 -周老大- ♂ (0 bytes) () 04/13/2022 postreply 18:42:12

• 學究氣重的人，要所有數據都擺在眼前才肯行動。殊不知有些數據是拿人命換的。緊急情況下隻能快刀斬亂麻，阻斷一切可能的傳染源 -''''''- ♀ (0 bytes) () 04/14/2022 postreply 06:30:58