纯数学和应用数学之间的相互作用是真正创新发生的地方。
The great powers are always searching for opportunities to gain power at the expense of their rivals, and they will use force if they think it will profit them.
生命中最要紧的事即是彼此。
Every sentence is a journey, and every word is a step.
Sometimes the hardest thing and the right thing are the same.