数学的美在于它允许我们抽象出现实世界的复杂性，专注于基本原则。
The beauty of mathematics is that it allows us to abstract away the complexities of the real world and focus on the underlying principles.
The best time to plant a tree was 20 years ago. The second best time is now.
"Every life is a story worth telling, if only we take the time to listen."
森林的真正价值不仅仅以木材的板英尺来衡量，还在于它所维持的生命和生态系统。