慢速英语:US Lawmakers, Obama Officials Debate Iran Deal

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hearing – n. a meeting or session at which evidence and arguments about a crime, complaint, etc., are presented to a person or group who will have to decide on what action should be taken

veto –v. to reject (a proposed law) officially : to refuse to allow (a bill) to become a law

astronomer – n. the scientific study of stars, planets, and other objects in outer space