发愤忘食,乐以忘忧,不知老之将至云尔。
发愤研究学问,常常忘记吃饭,一旦有所收获便又高兴地忘记了忧愁,连自己的渐趋衰老也没有感觉到。
艺术家必须是神圣的见证者。
The transformation of the coal industry requires both determination and patience.
Innovation is not just about technology; it's about changing mindsets.