煤炭行业必须发展以满足现代环境标准，否则将被淘汰。
The coal industry must evolve to meet modern environmental standards, or it will become obsolete.
The truth is often hidden in the details.
The greatest prosperity can exist only as the result of the greatest possible productivity of the men and machines of the establishment.
The concept of law is a complex one, involving not only rules but also principles, policies, and standards.
