guarantee by endorsement

例句：

1. 1.The company guarantees the quality of its products.
   这家公司保证其产品的质量。
2. 2. He guaranteed his word, so he kept his promise.
   他信守承诺，所以他履行了他的承诺。
3. 3.The bank guaranteed the loan, which helped us secure a mortgage.
   银行担保了贷款，这帮助我们获得了抵押贷款。