不管你用什么方法升级软件包，你都得花点时间决定新的配置文件中是否有你需要的东西。

Regardless of what method you choose to upgrade packages, you will have to devote some of your time deciding if there is anything in the new config files that you need.

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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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其中一项是历史记录，它提供了已经安装或者升级的软件包的详细信息。

One is History, giving you a detailed list of the packages you've installed or upgraded.

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