The selfish gene theory is not a theory about selfishness in the everyday sense. It is a theory about the evolution of behavior.

The most dangerous enemy is often ourselves.

体育教育的目标是发展健全的身体，作为健全心智的工具。

我们都是行走的进化史档案馆。

The poet is the guardian of human emotions.

万物纷繁各自返回根本，返回根本复归生命就能长存。