动词短语
中文翻译：要求提供证据
同义词：
['call for', 'summon', 'request']
例句：
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1. The policecalled in the witnesses to testify atthe trial.
警方召唤证人出庭作证。
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2. He called in his best friend tohelp him solve the puzzle.
他召唤了他的最好的朋友来帮助他解决这个谜题。
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3. She called in her mother to helpher with the cooking.
她召唤了她的母亲来帮助她做饭。