an additional dose that makes sure the first dose was effective
booster dose的用法和样例:
例句
用作名词 (n.)
Those young children who have not received a booster dose of vaccine in more than a year should receive an injection upon exposure. 一年多没有接受加强剂量疫苗注射的年幼儿童,受暴露时,应接受一次注射。