Life is not measured by the number of breaths we take, but by the moments that take our breath away.
复杂性理论告诉我们,并非所有问题都是平等的;有些问题本质上比其他问题更难。
跨越万里山川,拨开云雾前进;经历百次寒暑,踏着霜雨前行。