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.

疫苗的安全性和有效性是其研发中最重要的标准。

创新不仅仅是技术的问题；它是关于改变思维方式并接受新的思考方式。

La verdadera patria del hombre es su infancia.

The beauty of mathematics lies in its ability to describe the universe in a language that transcends cultural and linguistic barriers.

水产养殖的成功在于平衡产量与生态。