动词短语
中文翻译：要求
同义词：
['call', 'appeal to', 'demand', 'summon']
例句：
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1. The company called for a meeting to discuss the new policy.
公司要求召开会议讨论新政策。
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2. The teacher called for silence before he began his lecture.
老师在开始讲课前要求大家安静。
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3. The government called for an end to the war.
政府呼吁结束战争。