The more time I spent on mathematics, the more excited I got.
我在数学上花费的时间越多,我就越感到兴奋。
You can't change the past, but you can ruin the present by worrying about the future.
In the world of physics, we often find that the simplest questions are the hardest to answer.
客户的忠诚是赢得的,而不是给予的。