一种输入设备，有时是指标准打字机键盘的一部分，包括一个单独的用于有效数据输入的数字和功能键网格。
An input device, sometimes part of a standard typewriter keyboard, consisting of a separate grid of numerical and function keys arranged for efficient data entry.
功能键：键盘上，一组用来命令电脑进行某个特别功能的键；它通常贴有标签。
Function keys: a set of keyboard keys that are used to command the computer to perform a specific function and are generally labelled.
在功能键副键盘的最下方设置有输入法切换键；
The two sub keyboards comprises a digital processing sub keyboard and a function key sub keyboard;
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