【外刊英语精读】长城（下）| the Great Wall

The Great Wall helped rulers of the Central China Plains secure a relatively peaceful environment for development of an agricultural civilization. However strong it is, the Great Wall, made of stones, lime, bricks, wood or rose willow, still faced wind erosion and people's influence over centuries so that in many sections, only obscure ruins remain. "This is why we need to capture images for poste...去小宇宙查看完整单集简介前往小宇宙评论区与主播互动