名词
中文翻译：抵押邮件
同义词：
['collateral', 'security', 'guarantee', 'letter of credit']
例句：
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1. The company's decision to accept collateral mail is based on the risk assessment report.
公司接受抵押邮件的决定是基于风险评估报告。
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2. The bank issued a letter of credit to facilitate the trade between the two countries.
银行签发了信用证，以促进两国之间的贸易。
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3. The collateral mail was delivered within the agreed time frame, which helped to secure the loan.
抵押邮件在约定的时间内送达，这有助于获得贷款。