临时设置一个环境变量。

Set an environment variable temporarily.

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跟踪标志用于临时设置特定服务器的特征或关闭特定行为。

Trace flags are used to temporarily set specific server characteristics or to switch off a particular behavior.

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如果是临时设置类路径，那么每次打开新的命令窗口时，都需要再次设置它。

If you set the class path temporarily, each time you open a new command window you need to set it again.

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