Knowledge is represented in the mind as symbolic structures.
气候研究不仅是一个科学问题,也是一个社会问题。
No man is useless in this world who lightens the burden of someone else.
Never stop questioning, even when answers seem certain.
可持续性不再是一种选择;而是我们都必须承担的责任。
"Writing is a way of thinking, a way of understanding the world."