(also booster rocket)
a rocket that gives a spacecraft extra power when it leaves the earth, or that makes a missile go further助推器Topics Spacec2 - a device that gives extra power to a piece of electrical equipment（电器的）升压机，升压器
- an extra small amount of a drug that is given to increase the effect of one given earlier, for example to protect you from a disease for longer加强剂量Topics Social issuesc2
- a thing that helps, encourages or improves somebody/something帮助（或激励、改善）…的事物
- a morale/confidence booster士气／信心的激励
Topics Change, cause and effectc2 - (especially North American English) a person who gives their support to somebody/something, especially in politics（尤指政治上的）支持者，拥护者
- a meeting of Republican boosters共和党支持者的会议