我一直在挑战自己，因为我不想重复。

"The measure of a civilization is how it treats its weakest members."

Marine biodiversity is the foundation of our industry's future—we must protect it at all costs.

The study of psychology is a journey into the depths of the human experience.

教育与收入之间的关系是复杂的，并且在不同背景下有所不同。