Fangshan Zhangfang Ancient Battle Road Tour Guide - Hidden Arms Room4 / 11Fangshan Zhangfang Ancient Battle Road Travel Guide - Zhangfang Collection
Introduction to drainage ditches: The tunnels are flooded and there is a lot of water in the rainy season. The ancients set up drainage ditches in the tunnels for drainage.
Fangshan Zhangfang Ancient Battle Road Travel Guide - Xieshuigou
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