Don't cry to quit, cry to keep going.
Life is too short to hold grudges.
Life is not easy for any of us. But what of that? We must have perseverance and above all confidence in ourselves. We must believe that we are gifted for something and that this thing must be attained.
The study of mathematics is like air or water to the development of science.
数学不是一项观赏性运动。
世界是一本美丽的书，但对那些无法阅读它的人来说几乎没有用处。
系外行星研究的未来在于开发更灵敏的仪器和全球科学家的合作。
Language is a process of free creation; its laws and principles are fixed, but the manner in which the principles of generation are used is free and infinitely varied.