在某些情况下(比如要对软件包进行重大升级)，希望先试验修改环境所需的所有步骤，然后再修改生产环境。
On occasion (like a major upgrade to a software package), you may want to work out all the steps needed for a change to your environment before attempting the change in production.
在某些情况下(比如要对软件包进行重大升级)，希望先试验修改环境所需的所有步骤，然后再修改生产环境。
On occasion (like a major upgrade to a software package), you may want to work out all the steps needed for a change to your environment before attempting the change in production.
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