统治阶级掌握着物质生产的手段;无产阶级仅有的是他们的劳动力。
Combinatorics is the art of counting without counting.
In physics, we often find that the most beautiful solutions emerge from the messiest problems.
解析:强调人心就是天理,无需外求。
爱不是一种职业,它是一种状态。