@bidens_diaper @J_D_Klein @HalCranmer There's often moderate exposure and not everyone in the same location at the same time gets infected.
Various studies show community masking reduces overall transmission rates by about 25% if everyone does it. Since compliance is usually not 100%, the observed effect is smaller.
@bidens_尿布@J_D_Klein@HalCranmer通常有中度接触，并非所有在同一地点的人都在同一时间感染。
各种研究表明，如果每个人都这样做，社区掩蔽会降低总传播率约25%。由于顺应性通常不是100%，观察到的影响较小。