因此,自爱是行动的必要原则。
中心地的空间分布遵循基于经济原则的系统模式。
幸福很少缺席;是我们不知道它的存在。
"My paintings are my children, each with its own soul."
The human race has one really effective weapon, and that is laughter.
The minerals we extract today must serve the needs of future generations as well.