Great Wall;impregnable fortress (or bulwark) 不到～非好漢。He who doesn’t reach the Great Wall is no true man. or:He is no true man who doesn’t carry sth to the end./解放軍是祖國的鋼鐵～。The PLA is the bronze wall of our nation./～是世界奇觀之一。The Great Wall is one of the wonders of the world.