ring vaccination

英 美
  • 包围接种
  • ring n.戒指;环;圈;拳击场;马戏场;帮派n.铃声;钟声;电话;口气v.包围;环绕;形成圈v.打电话;回响;鸣响;按铃;听上去
  • vaccination n.接种疫苗;种痘
Noun:
  1. administering vaccine only to people in close contact with an isolated infected patient; prevents the spread of a highly infectious disease by surrounding the patient with a ring of immunization