数学的快乐来自于为理解而奋斗。
The joy of mathematics comes from the struggle to understand.
质量不是一种技术，而是一种哲学。
Diversity in tree species isn't just ecology—it's risk management for our planet's lungs.
The writer is either a practicing recluse or a delinquent, guilt-ridden one.
有谁背后没被他人议论过，又有谁在他人面前没议论过别人？有钱人不管说什么，别人都奉承他说的是真的，而穷人即使说的是真话，别人也都不相信是真话。