量子电动力学的发展表明,粒子的概念并不像曾经认为的那样简单。
"The best and most beautiful things in the world cannot be seen or even touched - they must be felt with the heart."
冒险本身就是值得的。
The world is full of people who have never, since childhood, met an open doorway with an open mind.
教育是老年人的最佳粮食。