Sometimes we get sad about things and we don’t like to tell other people that we are sad about them.
有时我们会为某些事情感到悲伤，而我们不愿意告诉别人我们为此感到悲伤。
不要委屈自己而迎合他人，不要用不正当的手段去获取名誉。
没有什么是一成不变的！
数学是一门活生生的学科，随着新的思想和发现不断演变。
Sustainability is not a choice; it's our responsibility to future generations.
The future belongs to those who are willing to take risks today.
最强大的生态系统是那些具有多样性的生态系统。