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(事業或政客的)支持者，搖旗吶喊者
If you say that someone is a cheerleader for a particular cause or an individual politician, you mean that they are one of the chief supporters of this cause or politician and work hard to raise support for them.
例句
Chancellor Helmut Kohl was the leading cheerleader for German unification.
赫爾穆特·科爾總理是德國統一的主要支持者。