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 only way to learn mathematics is to do mathematics.
Technology gives us precision in forestry operations, but wisdom tells us where and when to apply it.
历史不是发生了什么，而是在沉船中幸存下来的东西。