If everything was perfect, you would never learn and you would never grow.

数学的研究就像空气或重力——它无处不在，你看不到它，但你知道它在那里。

胖起来，过得好。

石油化工行业要顺应能源转型趋势，积极拥抱绿色低碳发展。

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.