保修：一年保修，终身维修用英文怎么说

一年保修 free one-year warranty since 生效日期
终身维修 durable maintaince and repair support

Quality assurance for one year，durable maintenance and repair

be guaranteed for one year
保修一年
lifetime service
终身维修

one year maintenance, lifetime repair

Quality assurance for one year, and forever maintainence