动力学的方程在用变分法的语言表达时是完全的。
It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge.
沙丘被风改变,但沙漠永远不会改变。这就是我们彼此间的爱。
I like to be a free spirit. Some don’t like that, but that’s the way I am.
Sustainability isn't just a trend; it's the future of leather tanning.