1. The Dutch have been impoldering land for centuries to reclaim it from the sea.
（荷兰人数百年来一直在围垦土地，将其从海中开垦出来。）
2. They decided to impolder the marshland and turn it into farmland.
（他们决定围垦这片沼泽地并将其改造为农田。）
3. The reservoir has impoldered a large area of land, creating a valuable water resource.
（这个水库围垦了大片土地，创造了宝贵的水资源。）