booster
n
1 thing that boosts 令人鼓舞的事物
a morale booster, ie sth that makes one feel more confident 精神鼓舞.
2 device for increasing power or voltage 增强动力或电压的装置.
3 (also `booster rocket) rocket used to give initial speed to a missile or spacecraft 助推火箭(给予导弹或航天器以初速度的).
4 dose or injection (of a medicine or drug) that increases the effect of an earlier one 辅助药剂, 增效药剂(用以加强前次药剂效力的).