reverse key
电流换向键 [电] current reversing key
快进*换向*快退键 FF PROG REW
换向电键 reversing key ; change-over key ; key change-over
他们也许会发现，除了可以发出那个短促的响声外，在玩具的一个管子里还有一个电灯按钮，一个可以播放音乐的键区，以及安装在一个管道内的换向镜。
They might discover that, as well as the squeaker, the toy had a button inside one tube which activated a light, a keypad that played musical notes, and an inverting mirror inside one of the tubes.
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