The meaning of a word is not a mental entity， but a social practice.

Shopping is arguably the last remaining form of public activity.

The blood in the animal body is impelled in a circle, and is in a state of ceaseless motion.

可持续性不是我们公司的一个部门；它融入我们做出的每一个决定。

人的正确功能是生活，而不是生存。