敲计算机或打字机上的退格键。
Hit the backspace key on a computer or typewriter keyboard.
youdao
我多希望嘴上有个退格键。
I wish my mouth had a backspace key.
退格键实际上是一个撤销功能,虽然它非常特殊。
The Backspace key is really an Undo function, albeit a special one.
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