The letter "x" often represents an unknown number in some Math exercises.
在一些数学练习中，字母“x”通常代表一个未知数。
'X is the only English letter he knows and he knows that American people speak English.
之所以这样说是因为小家伙只认识字母x，他知道美国人都说英语。
Every time you see the letter "a" followed by the letter "X," you have to press the space bar.
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。
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