What is the story of the 400-word composition on the scenery of Kaiping Diaolou, a world heritage site?

The hometown of Diaolou is called Kaiping, the hometown of Diaolou. There are more than 1000 Diaolou, the oldest of which is Yinglong Building in Sanmenli, Chikan. Perhaps the Ying Long Tower seen from various pictures is probably a watchtower with plain walls and simple design. Although not as brilliant as Ruishi Tower, the charm of the square lantern tower still exists, but Long Ta has witnessed the history of Kaiping for more than 400 years and the development of Kaiping Diaolou. Last summer vacation, I once visited Yinglong Building. From the entrance of the village to Ying Long Building, you need to cross the alley in the village. Alleys are paths between villagers' houses. The exterior walls of the villagers' houses are covered with antique blue bricks. Although antique, the ancient rhyme remains unchanged. Go to the end of the alley and see a magnificent watchtower-Ying Long Ta, which is three stories high. The couplets on both sides of the door are "welcome the cat, the dragon and tiger are vigorous", which probably means that the owner hopes for a bumper harvest and the dragon and tiger guard it! Looking closely, the imprint of history is still clearly visible-the small pit on the wall is not only the erosion of time, but also the trace of defending the villagers. The back of the wall is about 1 m, which highlights the protective function of Ying Long Building.