booster shots

同根派生

Many of them require multiple doses to get the immune system's attention or periodic booster shots to refresh its memory.
许多疫苗都需要多次注射来引起免疫系统的注意，不然就是要定期加强注射来唤醒免疫系统的记忆。
She said Ivins told her he had a chronic blood disorder and feared that it might be linked to the anthrax vaccine booster shots he had to take to work in the Fort Detrick laboratory.
她说，埃文斯告诉她，他患有慢性的血液紊乱症，怀疑可能和他在底特里克堡实验室工作中，不得不长期大剂量注射炭疽疫苗有关。
Rose bushes shoot again after being cut back.
玫瑰丛修剪後还能再长出新枝。
The sniper snapped off six rapid shots.
狙击手迅速地连放了六枪。
The door was riddled with shots.
门被子弹打得尽是窟窿。