The emphasis on clean air is arguably the biggest update to our public health guidance on Covid transmission.

对清洁空气的强调可以说是我们关于新冠病毒传播的公共卫生指南的最大更新。

Experts say the new strain does not change public health guidance to wear masks, wash hands and keep social distance.

专家表示，新毒株并不会改变戴口罩、洗手和保持社交距离等公共卫生指导。