booster
名词 booster:
a person who backs a politician or a team etc.
同义词:supporter, protagonist, champion, admirer, friend
someone who is an active supporter and advocate
a thief who steals goods that are in a store
同义词:shoplifter, lifter
an amplifier for restoring the strength of a transmitted signal
同义词:booster amplifier, booster station, relay link, relay station, relay transmitter
the first stage of a multistage rocket
同义词:booster rocket, booster unit, takeoff booster, takeoff rocket
an additional dose that makes sure the first dose was effective