动词短语中文翻译
中文翻译：号召
同义词：
['request', 'summon', 'appeal to']
例句：
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1.The president called upon the nation to unite in the face of crisis.
总统号召全国人民在危机面前团结起来。
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2. She called upon her friends for help during a difficult time.
她在困难时期请求朋友帮助。
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3.The teacher called upon his students to contribute their ideas to the project.
老师要求学生们为项目贡献他们的想法。