version if necessary
版本（如有需要）
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Leaving the existing installation intact also enables you to rollback your environment to the prior version, if necessary or desired.
保持现有安装的完整性还使您能够在必要时将环境回滚到先前版本。
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The site then stores an electronic version of the mutually signed contract for later review if necessary.
FORBES: Why An Educated Client Is A Good Client
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