Coal enterprises must enhance their sense of social responsibility and achieve the unity of economic and social benefits.
生活是世界上最罕见的事情。大多数人只是存在,仅此而已。
计算机不会在任何地方引入订单,因为它们会暴露机会。
The power of abstraction is that it allows us to ignore details that are not relevant to the task at hand.