call on
definitions
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to visit someone; to ask someone to do something; to urge or appeal to someonezh: 拜访某人;要求某人做某事;呼吁或敦促某人
examples
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The teacher called on John to answer the question.
老师叫约翰回答这个问题。
The teacher called on John to answer the question.
老师叫约翰回答这个问题。