保证人一个人或一个公司，对与质量、耐用性或性能相关的方面提供担保、保证或誓约 One, such as a person or corporation, that makes or gives a promise, assurance, or pledge typically relating to quality, durability, or performance.
你愿意当你弟弟的保证人吗？ Are you willing to stand surety for your brother?