《史记·三十世家·陈涉世家》
然后依凭华山当作城墙，凭借黄河作为护城河，依据亿丈高的华山，临守着深险莫测的黄河，作为守卫的险要之地。
然后践华为城，因河为池，据亿丈之城，临不测之溪以为固。
Then, relying on Mount Hua as a city wall, using the Yellow River as a moat, basing himself on the high and towering Mount Hua, overseeing the unfathomably deep Yellow River, as an important and precipitous area for defense.