booster
[ˈbustɚ]
n.
（电器的）增压机;
助推器，多级火箭的第一级;
热情的支持者;
例句:
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It was amazing what a morale booster her visits proved.
令人惊诧的是，她的访问大大鼓舞了士气。
来自柯林斯例句
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The combination of sex and treachery proved a copper-bottomed circulation booster.
事实证明，性和背叛的话题结合起来无疑大大增加了发行量。
来自柯林斯例句
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This win has been a great morale booster.
这次获胜是一次巨大的精神鼓舞。
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Historically, earnings season has been a confidence booster.
来自WSJ
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Montana Baucus is Big Coal's biggest booster.
来自SA
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Preliminary review of design of solid-fuel booster rocket to be finished.
来自NYTIMES