booster

柯林斯词典

1. N-COUNT A booster is something that increases a positive or desirable quality. 产生提升作用的事物[usu n N]
It was amazing what a morale booster her visits proved. 她的来访造成的士气提升作用真是惊人。
Praise is a great confidence booster. 表扬是一个很好的自信提升剂。
2. N-COUNT A booster is an extra engine in a machine such as a space rocket, which provides an extra amount of power at certain times. 助推器
Ground controllers will then fire the booster, sending the satellite into its proper orbit. 届时地面控制人员将点燃助推器，把卫星送入预定轨道。
3. N-COUNT A booster is a small injection of a drug that you have some time after a larger injection, in order to make sure that the first injection will remain effective. 辅助药剂
4. N-COUNT A booster is someone who supports a sports team, organization, person, or place very enthusiastically. 狂热支持者[美国英语] [oft supp N, N n]
A former associate of Mr. Pierce's was among the project's boosters. 皮尔斯先生以前的一个同事就是这个项目的支持者之一。