So when someone actually goes on a plane, they could be sick and they could actually be in this latency period in which they could actually have the disease but not exhibit any symptoms, and they could, in turn, spread the disease to many other people in the cabin.
所以，当有人上了飞机， 他们可能是病人， 也可能处于疾病的潜伏期， 也就是说他们会得上这种病， 但是海没有表现出任何症状， 于是他们就可能把疾病传染给 机舱中的其他人。