企鹅寓意什么意思

简介：Shanhaiguan guards the throat of western Liaoning. Once you pass through Shanhaiguan, you can reach the capital in a straight line. The geographical location is dangerous, so the Ming Dynasty attaches great importance to Shanhaiguan. After several expansions, up to now, Shanhaiguan City is more than four feet high and two feet thick. It is truly the first level in the world.