当你与它们匹配的键盘按钮消失。

The keyboard button disappear as you match them.

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标准键盘按钮对中年笨拙的拇指很合适(尽管触屏款式的也在出售)。

A QWERTY keyboard of buttons is kind to clumsy middle-aged thumbs (though touch screens are also on offer).

youdao

用PLC模块构成多路模拟量巡检，用动态I/O模块实现LED显示及扫描键盘按钮，使系统具有较高的经济性。

This system has high economy because of using itinerant monitor to analogy signals that made by PLC modules, using LED display and scan keyboard as press buttons that made by PLC dynamic I/O modules.

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