当调试开关打开时，可以输出调试信息。
When the debug switch is open, you can output debugging information.
幸运的是，Expect提供了各种有价值的调试开关，以报告其交互过程；这正是我确定CCNA01所生成的各种字符的方法。
Luckily, Expect has helpful debugging switches to report on its interactions; that's how I determined exactly what characters CCNA01 was emitting.
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