The most important quality for a scientist is curiosity - the desire to understand how things work.
忙碌的人没有时间流泪
实际发展水平与潜在发展水平之间的距离,前者由独立解决问题决定,后者由在成人指导下或与更有能力的同伴合作解决问题决定。
Sustainability isn't a choice—it's our responsibility to future generations.