The shale revolution has transformed the U.S. into a global energy leader.
页岩革命将美国转变为全球能源领导者。
International politics is a brutal and unforgiving arena, where states constantly strive to maximize their power and security.
国家有贤德之士而不任用,不是贤德之士的过失,而应该是拥有这个国家的君主的羞耻。