短振动，让你知道选择单元已采取移除此警示。
Short vibration to let you know the snap has been taken with option to remove this alert.
频道选择单元用 以在当地频道列表中，选择一频道信息。
The channel selection unit is used for selecting channel information from the local channel list.
给出了一种异步实现结构的异步加法单元、异步比较单元和异步选择单元电路。
The circuits of asynchronous adder unit, asynchronous comparator unit, and asynchronous selector unit are proposed.
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