booster shot 加强针
rocket booster 火箭助推器
booster seat 儿童安全增高垫
economic booster 经济促进因素
A: Have you taken your latest booster shot yet?
A：你打过最新的加强针了吗？
B: Not yet, I have an appointment tomorrow.
B：还没，我明天有预约。
1) 推动事物发展的人或事物
2) 航天或机械中的助推装置
3) 免疫接种中的加强针
1. 促进者；助推器；加强针
noun
1. people or things that increase or help something develop.
2. a device used to provide extra power, especially for a rocket.
3. a second or additional dose of a vaccine.
Synonym: enhancer, accelerator