False happiness renders men stern and proud， and that happiness is never communicated. True happiness renders them kind and sensible， and that happiness is always shared.

Investing in farmer education yields the highest returns.

爱不是占有，而是欣赏。

我歌唱不是因为我看不见，而是因为我有声音。

意志力不是美德，而是神经冲动的定向爆破。

中心地的规模和分布遵循一定的规律。