written warranty

• 担保保证书

written warranty的用法和样例：

例句

1. The product comes with the instruction manual and warranty.
   内附产品说明书与保证书。
2. Do not change any configuration or settings on a guest's computer unless you have their written approval on a liability waiver form.
   除非签下了书面的权利保证书，否则不要改变客人电脑的配置或设置。