Sustainable development is not a slogan but a concept that must be practiced. We must keep the land forever vibrant.
量子力学的本质在于它提供了一个数学框架,用于描述原子和亚原子粒子的行为。
世界是一个非常复杂的地方,而且它并没有变得简单。
Mathematics knows no races or geographic boundaries; for mathematics, the cultural world is one country.