地球及其周围的水域实际上必须具有其阴影所揭示的形状，因为它以完美的圆弧遮蔽了月亮。
To become truly great， one has to stand with people， not above them.
The essence of a free government consists in an effectual control of rivalries.
In the end, we are all alone, and that is the fundamental condition of human existence.
The coal industry is the backbone of America.