The Dutch people are famous for building dikes and draining water, reclaiming land from the sea and fighting against the sea. As we all know, the Netherlands is a low-lying country, and the word Holland means "low land" in Dutch. 27% of the country's land is below sea level, and 1/3 of the land is only about 1 m above sea level, with Amsterdam, the capital, built in a big place 5 meters below sea level. It is the Netherlands that is often attacked by tides and storms, causing great losses to people's lives and property. Therefore, the Dutch people often reinforce seawalls to prevent seawater intrusion. At the same time, the Netherlands is a country with a large population and a small land, with a per capita arable land of only 0.08 hectares. Therefore, the Dutch do everything possible to ask the ocean for new living space. Since13rd century, the total area of reclamation in the Netherlands has reached more than 7,000 square kilometers, equivalent to the whole land area.