Other alternative input devices include single switch devices, devices that track head movements, and alternative keyboards for persons with mobility impairments.
其它可选择的设备包括单一切换设备、跟踪头部移动的设备，和用于行动困难的人可选择的键盘。
Other alternative input devices include single switch devices, devices that track head movements, and alternative keyboards for persons with mobility impairments.
其它可选择的设备包括单一切换设备、跟踪头部移动的设备，和用于行动困难的人可选择的键盘。
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