4. 长城

奇迹wonder；miracle
俯瞰from a bird‘s-eye view；overlook
蜿蜒wind；zigzag
诸侯国kingdom
保护边境defend the border
把…连接起来have…joined together
在战争中损毁be ruined/damaged in wars
抵抗…的侵略resist the invasion of
旅游胜地a place of interest