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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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。

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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。

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Democrats and Republicans who signed the letter say a key goal is to encourage a thorough debate, before the U.S.potentially becomes mired in an even longer military commitment.

VOA: standard.2009.03.17

Earlier this month, Treasury Secretary Henry Paulson and Commerce Secretary Carlos Gutierrez sent a letter to key leaders of Congress, notably House Speaker Nancy Pelosi, D-Cal.

FORBES: Magazine Article

V, has circulated a letter agreeing with most key points of the OFR proposal such as the need for an LEI, global coverage and the ability to use LEIs without charge and points to the advantages for the industry.

FORBES: Global Financial Regulation -- The LEI Looks All-American

Among others members of Congress, Michelle Bachmann has written a letter to inspectors general of key Washington departments inquiring as to Muslim Brotherhood influence in Washington's halls of power.

CENTERFORSECURITYPOLICY: Center For Security Policy