动词短语
中文翻译：宣战
同义词：
['announce war', 'declare war on', 'declare hostilities']
例句：
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1. The king declared war on his enemies.
国王宣布与敌人开战。
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2. They announced the war to the public.
他们向公众宣布了战争。
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3. He declared war on the enemy without waiting for permission.
他未经允许就宣战了敌人。