最初,“城”与“市”是两个不同的概念,它们之间本没有什么联系。城大约在4000多年前的原始社会末期就出现了,当时,城是部落之间进行战争的堡垒。我国古代的城,规模大的叫城,也叫都邑,小的叫城邑。军队的统帅驻扎的城叫做牙城。城有城墙护卫,古代的城墙一般有10米到12米高,商代的城墙高达20米。城墙也称城垣,城墙上呈凹凸形的小墙叫做女墙。古代的城墙都是夯土建筑,到了宋代,砖砌的城墙渐增,至清代,都是整齐坚固的砖石城墙了。作为国都的城,都建有规模巨大的宫 Initially, “city” and “city” are two different concepts, there is no connection between them. The city emerged at the end of Primitive Society about 4,000 years ago when the city was the bastion of the war between the tribes. Ancient city of our country, the large scale called the city, also known as the town, small town called. The city in which the military commander is stationed is called a dental city. City wall guard, the ancient city walls are generally 10 meters to 12 meters high, the Shang Dynasty city walls up to 20 meters. Also known as the city wall wall, wall was concave and convex small wall called the female wall. Ancient walls are rammed earth buildings, to the Song Dynasty, brick walls gradually increased to the Qing Dynasty, are neat and sturdy masonry walls. As the capital city, have built a huge palace