慢速英语:民主党赢得众议院控制权 国会将产生分歧

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challenge - v. to say or show that (something) may not be true, correct, or legal

tremendous - adj. very good or excellent

factor - n. something that helps produce or influence a result

contest - v. to struggle or fight for or against something

incumbent - n. a person who holds a particular office or position