Then from the command line, specify the environment variable name with its value.
然后，在命令行上指定环境变量名和值。
It has practical value, only if the measurement result comes from real target and environment.
只有把目标放到特定环境中研究，所得结果才有实用价值。
It has practical value, only if the measurement result comes from real target and environment.
只有把目标放到特定环境中研究，所得结果才有实用价值。
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