名词
中文翻译：Unknown
同义词：
['external reference', 'external source', 'external citation']
例句：
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1. This article is based on external references.
这篇文章基于外部引用。
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2.The company's research relies heavily on external sources of information.
该公司的研究大量依赖于外部信息源。
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3.The book was cited extensively in the academic literature.
这本书在学术文献中被广泛引用。