@bidens_diaper @J_D_Klein @HalCranmer Universal (also called two-way) masking is more effective than PPE because it first reduces the amount of virus in the environment and then amount inhaled from the environment. CDC mannequin study w/shitty cloth masks measured this at 72%->almost 4x exposure possible.
@bidens_尿布@J_D_Klein@Halcramer Universal（也称为双向）掩蔽比PPE更有效，因为它首先减少环境中的病毒数量，然后减少从环境中吸入的病毒数量。CDC人体模型研究（带破布面具）测得这一比例为72%->；几乎有4倍的曝光率。