学习数学的唯一方法就是做数学。
爱是一个战场，但它是一个值得为之奋斗的战场。
It is one of the superstitions of the human mind to have imagined that virginity could be a virtue.
Collaboration is key. No single company or country can solve the energy and climate challenges alone.
Writing is the only way I have to explain my own life to myself.