Remember that you need to press a letter key or keys to trigger the rocket motion; depending on your computer's speed, you might experience a slight delay before the rockets appear.
记住，您需要按一个或多个字母键来触发火箭运动；根据您的计算机的速度，您可能在火箭出现之前会感觉到一点延迟。
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。
After it opens, pressing the appropriate letter key executes the function.
助记符模式打开以后，按下适当的字母键就可以执行相应的功能。
After it opens, pressing the appropriate letter key executes the function.
助记符模式打开以后，按下适当的字母键就可以执行相应的功能。
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