ASCII设备控制字符最初是用于控制硬件设备的，如：打印机、录音设备。这个字符不属于HTML文档。
ASCII device control characters were originally designed to control hardware devices like printers and tape drives. These characters have nothing to do inside any HTML document.
屏幕上所显示的是CCNA01# ；对于许多设备来说，这是非常典型的，这个提示符实际上嵌入了一些不可见的控制字符。
What shows on the screen is just CCNA01# ; as is typical for many devices, though, this prompt actually embeds invisible control characters.
屏幕上所显示的是CCNA01# ；对于许多设备来说，这是非常典型的，这个提示符实际上嵌入了一些不可见的控制字符。
What shows on the screen is just CCNA01# ; as is typical for many devices, though, this prompt actually embeds invisible control characters.
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