The most important political development of the last half century has been the spread of liberal democracy around the world.
比培训员工后失去他们更糟糕的是不培训他们而留住他们。
The only way to deal with an unfree world is to become so absolutely free that your very existence is an act of rebellion.
电子并非一个简单不可分割的实体,而是一个复杂系统,其行为只能通过量子力学定律来理解。