动词短语
中文翻译：被召唤
同义词：
['be required to', 'be called upon to']
例句：
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1. The team was called on to perform a difficult task.
团队被要求执行一项困难的任务。
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2. He was called for duty at the crack of dawn.
他在黎明时分被召唤上岗。
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3. The company is being called for a meeting tomorrow to discuss its future plans.
公司明天将召集会议讨论其未来计划。