当你想要换到键盘另一半上的键时，只要长按空格键就可以了。
Simply hold down the space bar when you want to switch to the keys on the alternate side of the keyboard.
每当你看到字母X紧随在字母a后面，你就按下键盘的空格键。
Every time you see the letter "a" followed by the letter "X," you have to press the space bar.
只需使用鼠标或者键盘上的空格键就可以预览图片，电影，音频或者文本文件。
To preview an image, movie, audio track or text file just select it with your mouse or keyboard then tap the space key once to 'peek' inside.
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