@itshullabalulu 1. Individual assessment of risk and individual measures (e.g. one way masking) don't work very well. Transmission is a community-level process.
2. Some of the people you think are still taking precautions really aren't, at least not to the same degree.
3. Virus more contagious
@它的喧闹声。个人风险评估和个人措施（例如单向掩蔽）效果不佳。传播是一个社区层面的过程。
2.一些你认为仍在采取预防措施的人其实不是，至少程度不同。
3.病毒更具传染性