Words are, of course, the most powerful drug used by mankind.

正因为我是你妈妈说话才最算数，因为我最了解你。

环境不是刺激的马赛克，而是一个力场，其中每个部分都与其他部分动态相关。

科学中的每一项伟大发现都是大胆想象的结果。

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.

The history of life is a history of change.