在 A、B、C、D 和 F 评分体系中，前四个字母通常被认为是及格。
In the A, B, C, D and F grading system, the first four letters are typically considered passing grades.
在小写字母之间出现大写单词通常很难看。
The appearance of a word in upper case between lower caps is usually ugly.
在一些数学练习中，字母“x”通常代表一个未知数。
The letter "x" often represents an unknown number in some Math exercises.
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