创建一个名为show_menu的函数，通过此函数来演示设备的大小。

Create a function named show_menu that demonstrates the size of the device.

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设想中，该演示设备能让每千瓦电成本降到5美分活或者更低，这让燃煤发电厂的日子很不好过。

Ideally, that demonstration facility would hit a cost of 5 cents or lower per kilowatt, giving coal-fired plants a run for their money.

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展示了对内存指标的轮询来演示设备指标监控，通过对事务率表格的轮询来演示对特定于应用程序的指标的监控。

A poll of the memory metrics was shown to demonstrate monitoring of device metrics, and a poll of the transaction rate table was shown to demonstrate monitoring of application-specific metrics.

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