booster /ˈbuːstə/

• 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]

  例：

  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。

  例：

  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

  例：

  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]

  例：

  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。