Prophylatic immunization

• 预防接种

Prophylatic immunization的用法和样例：

例句

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。