Every improvement in the circumstances of the society tends either directly or indirectly to raise the real rent of land, to increase the real wealth of the landlord, his power of purchasing the labour, or the produce of the labour of other people.

每个孩子都应该在他们读的故事中看到自己。

Nature has been the greatest chemist of all time, and we are just beginning to understand its secrets.

We change our behavior when the pain of staying the same becomes greater than the pain of changing.

可持续发展不仅仅是一种趋势，更是我们对后代的责任。