保证单词用英文怎么说

"guarantee" 是 "保证" 的英文翻译。这个词来源于拉丁语 "garantia"，意思是 "保护、担保"。

例句：

I can guarantee that the product will be depvered on time. (我可以保证产品会按时交付。)
The bank offered a guarantee on the loan. (银行为贷款提供了担保。)
The company's reputation is a guarantee of quapty. (公司的声誉是质量的保证。)