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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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。

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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.

ATM交换单元采用的输入排队由于存在队头阻塞严重影响了吞吐率，并且信元丢失率也很大。

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But Dr Jan van der Merwe, head of the Input Pain Management unit at St Thomas's Hospital, London, told BBC News Online it was difficult to take conclusive findings from looking at brain activity because so many things were happening at the same time.

BBC: Brain to blame for mystery back pain