当一个键与另一个键组合使用时，它可改变另一个键的含义，例如，在按下某个字母键时产生大写字母。
A key that, when pressed in combination with another key, gives the other key an alternative meaning; for example, producing an uppercase character when a letter key is pressed.
当一个键与另一个键组合使用时，它可改变另一个键的含义，例如，在按下某个字母键时产生大写字母。
A key that, when pressed in combination with another key, gives the other key an alternative meaning; for example, producing an uppercase character when a letter key is pressed.
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