幸福不在于财富和黄金，幸福之感存在于灵魂之中。

"In observational studies, we often have to rely on assumptions that are not directly testable."

The city is the greatest human invention, and architects must serve its evolution.

"The blank page is both the writer’s greatest fear and greatest hope."

农民不仅仅种植作物，他们还培育社区。