extended warranty的用法和样例：
例句
- The quality guarantee period is divided into the normal guarantee period and the extended guarantee period for the principle components.
质量保证期分为正常质量保证期和主要部件的延长质量保证期。 - The warranty period shall be 12 months counting from the date on which the buyer, the end-user and the seller sign the Certificate of Final Acceptance of the Contract Goods.
保证期自买方，最终用户和卖方签署合同货物最终验收证书之日起十二个月。
