命令或指示，尤指由中央权威机构发出。
An order or instruction, especially one issued by a central authority.
当值班轮机员接到危急命令或指示时，它必需向轮机长汇报。
When the duty engineer receives an urgent order or instruction. he must report to the chief engineer.
而且由于每个UNIX命令都返回一个指示成功或失败的状态代码，因此，您可以使用任何命令作为“条件”——而不仅仅是使用测试操作符。
And because every UNIX command returns a status code reflecting success or failure, you can use any command as a conditional — not just the test operators.
您可以通过命令行或图形化用户界面(HealthCenter)为每个健康指示器检索建议。
You can retrieve recommendations for each health indicator from the command line or through a graphical user interface (the health Center).
权威的指示；军事命令或指挥。
权威的指示；军事命令或指挥。
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