数学的美在于它允许我们从物理世界中抽象出来，专注于基本原理。
The beauty of mathematics is that it allows us to abstract away from the physical world and focus on the underlying principles.
The deepest urge in human nature is the desire to be important.
"The immune system is the key to fighting cancer."
Quality is never an accident; it's always the result of intelligent effort.
理解经济周期的关键在于认识到它们是对实际冲击的均衡反应。
