心理学概念必须在行动中证明其价值。
通往可持续能源未来的道路需要一种平衡的方法,考虑经济、环境和社会因素。
可持续性不再是可选项,而是进入全球市场的入场券。
The individual can understand his own experience and gauge his own fate only by locating himself within his period, that he can know his own chances in life only by becoming aware of those of all individuals in his circumstances.
代数是人类创造的一种智力工具,用于清晰地表达世界的数量关系。
Heros come and go,but legends are forever.