名词
中文翻译：保证书
同义词：
['promissory note', 'guarantee', 'letter of credit']
例句：
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1.The bank required a letter of pledge to secure the loan.
银行要求一份抵押品来担保贷款。
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2. The borrower must provide a letter of pledge before signing the contract.
借款人在签订合同前必须提供一份抵押品证明。
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3. The company issued a letter of pledge for the new project.
公司为新项目出具了一份抵押品证明。