名词
中文翻译：证明文件
同义词：
['certificate', 'document', 'proof', 'voucher']
例句：
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1. We need to post our proof of identity before we can board the plane.
我们需要在登机前提交我们的身份证明。
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2. The company requires all employees to submit proof of vaccination before they can start work.
该公司要求所有员工在开始工作前提交疫苗接种证明。
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3. The bank issued a new proof of account for me after I had my passport renewed.
在我更新护照后，银行为我签发了新的账户证明。