这就意味着，当瘫痪病例被发现时，小儿麻痹症病毒已经扩散了。
This means by the time a paralytic case is found, the poliovirus has probably spread.
小儿麻痹症是一种可怕的疾病，它使许多人丧失了生命和瘫痪。
Polio is a terrible disease that kills many and paralyzes others.
小儿麻痹症是一种可怕的疾病，它使许多人丧失了生命和瘫痪。
Polio is a terrible disease that kills many and paralyzes others.
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