经验的直接内容是心理学必须考虑的唯一事实。

线性经济是一个从根本上就有缺陷的系统。它是一个获取、制造和浪费的系统。

As we delve deeper into the quantum world, the importance of topology in understanding and manipulating quantum states becomes increasingly clear.

要理解现在，我们必须首先直面过去。

Natural experiments are a powerful tool for understanding causal relationships in the real world.

The only real hope is the hope of the heart.