called upon
definitions
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to have been visited by someone formally or politelyzh: 被某人正式或礼貌地拜访过
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to have been asked to do somethingzh: 被要求做过某事
examples
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We were called upon by the ambassador last week.
我们上周被大使正式拜访过。
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He was called upon to lead the team.
他被要求领导团队。