名词
中文翻译：宣布者
同义词：
['announcer', 'announcer', 'announcer']
例句：
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1. The president announced the new policy at the press conference.
总统在新闻发布会上宣布了新政策。
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2. The scientist announced the discovery to the world.
科学家向全世界宣布了这个发现。
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3. The teacher announced the exam results during the assembly.
老师在集会上宣布了考试结果。