This summer, the US has seen an unusual outbreak of enterovirus, a big, diverse group of viruses that can cause illnesses ranging from summer colds to polio and hand, foot, and mouth disease.

今年夏天，美国爆发了一次不寻常的肠道病毒疫情， 这是一大类多样化的病毒，可引起从夏季感冒到小儿麻痹症和手足口病等多种疾病。