This solution would call for multiple sound output devices (on many systems, programs such as Festival and MPlayer can direct the output to a specific device) or coordinated input to one device.
这种解决方案需要调用多个输出设备(在许多系统中，Festival和MPlayer等程序可以将输出发送到特定的设备)或者在一个设备上协调输入。
Mobility-impaired individuals for whom alternative input devices, such as eye-tracking or verbal, are necessary.
行动不便的用户 —— 对于这类个体，必须提供其他的输入设备，例如眼球追踪技术（eye-tracking）和通过口述方式输入。
Chapter 7, "input Drivers", discusses the kernel's input subsystem that is responsible for servicing devices such as keyboards, mice, and touch screen controllers.
第7章，《输入设备驱动》，讲解了内核中为键盘、鼠标和触摸屏控制器等输入设备提供的输入子系统。
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