a thing or person that helps increase or promote something, in particular
起推动(或推进)作用的事(或人),尤指:
【医】 增强辅剂量。
the first stage of a rocket or spacecraft, used to give initial acceleration and then jettisoned
(火箭,飞船的)助推器。
a device for increasing electrical voltage or signal strength
(电压的)增压器;(电信号的)放大器。
[in combination]a source of help or encouragement
推动;鼓励
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job fairs are a great morale booster .人才交流市场大大地鼓舞了人心。
〈北美〉 积极的支持者;热心的拥护者。
〈北美,非正式〉 (商店的)窃贼,扒手。