服务条款：乙方免费提供两年本软件升级及软件维护服务。

Terms of service: B offers two free software upgrades and the software maintenance services.

youdao

服务条款：乙方免费提供两年本软件升级及软件维护服务。

Terms of service: B offers two free software upgrades and the software maintenance services.

youdao