In pictures from cities in China， South Korea， Singapore， and Japan， all of which have experienced significant coronavirus outbreaks， almost everyone is wearing face masks.
中国、韩国、新加坡和日本城市的照片中，几乎所有人都戴了口罩，但以上国家都经历了冠状病毒大爆发。
That prompted many Americans to wonder — should we be doing that too？ The answer is that unless you are sick， it’s not a particularly good idea.
这使得很多美国人想：我们也应该那么做吗？答案是，除非你病了，否则这个主意不怎么样。
The CDC “does not recommend that people who are well wear a facemask to protect themselves from respiratory illnesses， including COVID-19 [the disease caused by the novel coronavirus]. You should only wear a mask if a healthcare professional recommends it.”
CDC“不推荐健康的人戴口罩以避免感染包括COVID-19（由新冠病毒引起的疾病）在内的呼吸疾病。只有医疗专家推荐的情况下，你才应该戴口罩。”
“The most important thing in the conversation about masks is that there is a shortage，” Katz told me. “We need to make sure that we have enough for our front-line health care workers.” That said， there’s an important use case for masks： If you are sick， they can protect the people around you. The CDC does recommend that people who show symptoms of Covid-19 wear a mask “to help prevent the spread of the disease to others.”
“在关于口罩的谈话中，最重要的事情就是，存在短缺。”卡茨（Katz）告诉我，“我们需要保证，有足够的口罩给前线医护工作者。”这就是说，口罩是有重要用例的：如果你病了，口罩能保护你周围的人。CDC确实推荐出现Covid-19发病症状的人戴口罩“以阻止疾病传染他人”。
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