名词短语
中文翻译：外部参考
同义词：
['external reference', 'external source of information']
例句：
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1. The company's decision to move its headquarters outside the city was met with mixed reactions from employees and customers.
该公司决定将总部迁至城外，员工和顾客对此反应不一。
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2.The research team used external references to gather data for their study.
研究团队利用外部参考资料来收集他们的研究数据。
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3. The book provides an excellent outside reference for those studying the history of the region.
这本书为研究该地区历史的人提供了极好的外部参考资料。