The word "water". Swimming from Mao Zedong was written on 1956. But the old man wrote this word while inspecting Wuhan and swimming in the Yangtze River.
1957, Wuhan Yangtze River Bridge was completed, which Mao Zedong called "a bridge flying north and south, and a big ditch turning into a thoroughfare", which vividly described the majestic momentum of Wuhan Yangtze River Bridge and its important role in China's north-south traffic.