物理定律必须以独立于坐标系选择的方式表述。
The Internet is a living, evolving entity that requires constant attention and care.
每一个结束都是一个新的开始。
The Olympic Games are the quadrennial celebration of the springtime of humanity.
You have to fight to reach your dream. You have to sacrifice and work hard for it.
The most important thing in mathematics is to understand the concepts, not just to memorize formulas.