御敌于国门之外 meaning in Chinese

fight against the enemy on the frontier; resist [engage] the enemy outside the gates

To keep the enemy out his empire , qin shihuang had all the walls joined up
为了御敌于国门之外，秦始皇把所有的城墙连接起来。
To keep the enemy out of his empire , emperor qin shihuang had all the walls joined up
为御敌于国门之外，秦始皇令人将所有的边墙连成一体。
In old ancient china , the first emperor of the qin dynasty , named ying zheng , had resisted enemy beyond the national borders by building the great wall , but in modern times , the national boundary has been broken down by the war in the field of finance , which is just unfolding
古代的中国，秦始皇修长城御敌于国门之外，当今的世界，早已打破国界的金融之战正方兴未艾。入世后，中国金融业更是面临西方商业银行咄咄逼人的挑战，显然，仿效古人筑城御敌已不可能。