n. a written assurance that some product or service will be provided or will meet certain specifications
n. an unconditional commitment that something will happen or that something is true
n. a collateral agreement to answer for the debt of another in case that person defaults
v. give surety or assume responsibility
n. 担保, 抵押品, 保证书
vt. 保证, 担保
1. I can guarantee that this product will last for years.
我可以保证这个产品可以使用多年。
2. The company offers a money-back guarantee if you are not satisfied.
如果您不满意，这家公司提供退款保证。
3. She made a promise to guarantee his safety during the trip.
她承诺在旅行期间保证他的安全。