If you are NOT sick: You do not need to wear a facemask unless you are caring for someone who is sick (and they are not able to wear a facemask). Facemasks may be in short supply and they should be saved for caregivers. 这就是3/31/2020美国CDC官方网站上美国抗疫当局的口罩政策。这一天,美国新增 ...