应用程序需要升级，必须应用软件维护。
Applications are upgraded, software maintenance must be applied.
包括所以的软件发布升级，软件维护和应用软件。
Included may be also Software Release Upgrades, Software Maintenance and Application Software.
包括所以的软件发布升级，软件维护和应用软件。
Included may be also Software Release Upgrades, Software Maintenance and Application Software.
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