@OfDragonflies @DrLeanaWenMD US defines 'severe' as requiring hospitalization.
If you're sick as a dog for weeks (or not, either way) and have debilitating or even deadly long term damage and symptoms, not severe!
@DrLeanaWenMD US将“严重”定义为需要住院治疗。
如果你像狗一样病了好几周（或者没有病，无论哪种方式），并且有衰弱甚至致命的长期损伤和症状，都不严重！