名词
中文翻译：确认书
同义词：
['certificate', 'proof', 'voucher', 'endorsement']
例句：
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1. The letter of confirmation will be sent to you shortly.
确认书将很快寄给你。
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2. The bank required a letter of confirmation before approving the loan.
银行在批准贷款前要求一份确认书。
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3. The company issued a letter of confirmation for the new project.
公司为新项目发出了确认书。