booster shot

1. A tetanus booster shot may be required if a wound is deep or dirty.
   深部伤口或较脏的伤口也需要破伤风疫苗的注射。
2. Boostrix, which is given as a single-dose booster shot, is the first vaccine approved to prevent all three diseases in older people.
   Boostrix是第一个获得批准用于老人预防3种疾病的单剂量加强针给药的产品。
3. Still, as even George Bush admitted at the time of announcing it, the stimulus will be no more than a temporary "booster shot".
   不过，正如布什在宣布经济刺激政策的时候所承认的，这种刺激只能起到一时的作用而已。
4. They hoped their findings would settle the question of whether a booster shot was needed for hepatitis B.
   他们希望研究结果能解决是否须要注射乙型肝炎疫苗加强剂的问题。

noun

1. an additional dose that makes sure the first dose was effective

   Synonym:    boosterbooster doserecall dose