最小作用量原理是物理学的一个统一原理。

农业的未来在于平衡生产力与环境责任。

人民有三种忧患：饥饿的得不到食物、寒冷的得不到衣物、劳苦的得不到休息。

To every action there is always opposed an equal reaction； or， the mutual actions of two bodies upon each other are always equal， and directed to contrary parts.

天生犯罪人是其有机命运的奴隶。