要写一封好的情书，你应该在不知道要说什么的情况下开始写，然后在不知道自己写了什么的情况下结束。
To write a good love letter， you ought to begin without knowing what you mean to say， and to finish without knowing what you have written.
The most important thing in mathematics is to understand the concepts, not just to memorize formulas.
复仇是女人的乐趣。
The truth is often found in the margins.