【平遥古城：会呼吸的城墙】经年累月，平遥古城墙只有外墙覆盖了砖石，而内墙只夯了土。这种设计是为了给古城墙留有呼吸的空间。平遥的天气十分干燥，砖墙会使得空气不流通。#平遥古城# #山西平遥# #世界遗产在中国# #CGTN传承中国# Over the years, only the outside of the Pingyao city wall has been covered with bricks. The inner face is simply rammed earth. The reason is that it was designed to be a living structure, capable of breathing. The weather in Pingyao is quite dry, and a brick wall would have restricted the fresh air for people to breathe. http://t.cn/A6QfInqJ