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1·I did encounter a bug though: the spread mode USES a different wallpaper (using the Unity 2d Launcher workspace switcher), as you can see in the video below.

尽管我遇到了一个bug：在扩展模式中使用了一张不同的壁纸(当使用Unity 2d Launcher工作区切换器的时候)你可以在下面的录像中看到。

2·A extendible Video-Audio Switcher circuit by hand-selecting or automatic sequential switching was intro duced.

介绍了手选和自动顺序切换均可任意扩展的视音频切换电路。