如果没有冬天的寒冷来赋予它甜蜜，夏天的温暖又有什么好处呢？
The best way to find out if you can trust somebody is to trust them.
"Every child deserves to see themselves in the stories they read."
数学的美在于它让我们以一种既精确又深刻的方式看待世界，揭示支配万物的潜在秩序。