Flow is being completely involved in an activity for its own sake. The ego falls away. Time flies. Every action, movement, and thought follows inevitably from the previous one, like playing jazz. Your whole being is involved, and you're using your skills to the utmost.

可持续采矿不再是可选项 - 这是我们对后代的责任。

学习的速度决定数字经济增长的速度。