生活中唯一不变的是变化。
你不必成为数学家也能对数字有感觉。
"Matching methods can be a powerful tool when randomization is not possible."
The best time to plant a tree was 25 years ago. The second best time is today.
无论生活中发生什么,都要善待他人。善待他人是留下的美好遗产。