channels switching 线路转换
Instead of switching channels during the AD break get up and walk about the house.
别再在广告期间不停地调台了，站起来，到处走动走动吧。
Once this testing process is complete, switching channels for the next device are selected.
在完成该项测试后，则选择下一个器件的切换通道。
The video playback is choppy at best, and switching channels can take a good 20 seconds. (If your hardware is faster than mine, you might get better results.)
在最好的情况下，视频播放也会出现断断续续的现象，而且切换频道足足要花 20 秒（如果您的硬件比我的快，得到的结果可能会好一些）。
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