模型不是水晶球，但它们是理解未来的最佳工具。

Words are not mere sounds or marks， but signs of facts.

The United States, in their expansive capacity, are capable of containing within their limits the whole population of the earth.

大自然似乎有意通过电现象向我们揭示物质的一种新的、迄今为止隐藏的特性。

世界上充满了故事，但只有少数值得讲述。

Action and knowledge are not obstacles to each other.