问题的数学表述通常比其解决方案更重要，后者可能仅仅是数学或实验技巧的问题。
"Silence is the language of the unspeakable."
You are never too old to set another goal or to dream a new dream.
To be a good writer, you have to be a good reader first.
尘世存在的意义，并不像我们习惯于认为的那样，在于繁荣昌盛，而在于灵魂的滋长。