名词
中文翻译：清关文件
同义词：
['customs clearance documents', 'clearance certificates']
例句：
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1. We need to clear these clearance papers before we can proceed with the shipment.
我们需要在装运前清理这些清关文件。
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2. The customs agent will need to inspect the clearance papers to ensure they are in order.
海关官员需要检查清关文件以确保它们整齐有序。
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3. The company has been cleared for export by the customs authorities.
该公司已获得海关当局的出口许可。