Baoqing made of iron was circulated as "Baoqing" because during the Taiping Heavenly Kingdom, Baoqing was surrounded by Shi Dakai for more than three months, but it still failed to capture Baoqing. Baoqing made of iron? . Yiyang, wrapped in silver, is located in the lower reaches of Zijiang River, with dense river network and rich water resources. Due to the convenient land and water transportation, Yiyang has become a bustling place of commerce and trade, and silver is rolling in like water, which is called by the people? Yin Cheng and Yiyang are also made of silver? . Paper paste Changsha means that Changsha is located in the plain, so there is no danger in keeping it. It is difficult to keep after the war, so it is called paper-wrapped Changsha.