a large number of cases of a particular disease happening at the same time in a particular community 流行病
the outbreak of a flu epidemic
流感的爆发
an epidemic of measles
麻疹的流行
a large number of cases of a particular disease happening at the same time in a particular community 流行病
the outbreak of a flu epidemic
流感的爆发
an epidemic of measles
麻疹的流行