名词
中文翻译：主要文件
同义词：
['main file', 'primary document', 'principal document']
例句：
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1. The company has a primary file of customer information.
该公司拥有客户信息的主要文件。
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2. The government issued a primary file on the environmental impact of the project.
政府发布了关于该项目对环境影响的初步文件。
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3.The team needs to review the primary file before starting their analysis.
团队在开始分析之前需要审查主要文件。