本文从切换方案的选择及准备工作方面阐述了系统切换应该注意的问题。

This article elaborated from the plan's choice and the preparatory work aspect that the system switching should be pay attention.

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在表演时，他故意让自己的乐器摆出一种不方便的方位，使他在演唱中途从吉他切换到管风琴时需要在舞台上疯狂地奔跑。

When performing, he positions his instruments in a way that is deliberately inconvenient, so that switching from guitar to organ mid-song involves a mad dash across the stage.

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您可以从 GCC 得到提示：为每个应用程序维护多个环境变量集，并根据手头的工作从一个集合切换到另一个集合。

You can take a cue from GCC: maintain many sets of environment variables per application and switch from one pool to another depending on the work at-hand.

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