Specifies a hardware scan code for the key.

指定键的硬件扫描码。

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For excellent and sufficient reasons, its keys emitted not the character itself but a "scan code", which was then remapped to the hardware level, just as a compiler would.

有充分的理由支撑，它(IBM PC)的ESC键释出的不是字符本身，而是一个“扫描指令”。随后这个指令被映射至硬件层面，就像编译器所做的。

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