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。
2
Yet, if input lag ever does rear its ugly head, at least you have options for keeping the problem in check.
不过万一要是输入延迟露脸了，你至少有余地控制住问题。
3
Head-of-line blocking exists in input queuing used by ATM switching element , which severely affects the throughput , and the cell lo ss is also very large.