theGreatWall;长城
outsidethecity[citywall]城外
theeastern[western]partofthecity;东[西]城
inner[outer]city内[外]城
thedifferencebetweentownandcountry;城乡差别
theinterflowofcommoditiesbetweentheurbanandruralareas城乡商品交流
ChengHun城浑