Prophylatic immunization

英 美
  • 预防接种
    1. Never have so many resources been focused on immunization - yet problems remain.
      虽然从来没有那么多的资源被用于预防接种,但仍然存在着不少问题。
    2. More worrisome, currently high immunization rates may be unsustainable for a number of reasons.
      更令人忧心的是,由于种种原因,目前的高预防接种率有可能保持不住。