Meanwhile， the World Health Organization raised its risk assessment worldwide to the highest level， as more countries — now nearly 50 — reported cases.

同时，世界卫生组织将其风险评估提高到了最高等级，由于更多国家——现在是近五十个——报告了病例。

These developments have many Americans wondering — wait， are survival preparations now necessary？ Is stockpiling food a sensible idea or a massive overreaction？ Is it selfish or paranoid to be planning for the worst？

这些发展情况让很多美国人都在想：等等，现在是不是该为灾难幸存做准备了？囤食物是理智的想法还是过度反应？做最坏的准备是自私还是多疑？

And among the coronavirus preparation guide that public health experts gave the Americans， there is “You don’t need to wear a face mask if you’re well， but you should if you are sick”.

而在公共卫生专家给美国人的冠状病毒预防指南中，有一条是：“如果你很健康，则不需要戴口罩，如果你病了，就应该戴口罩。”

Here are the reasons：

理由如下：