假如你有机会到江苏的太湖、湖南的洞庭湖、江西的鄱阳湖或广东的珠江三角洲去旅行,你会看到一幅有趣图景:湖泊、河道里有不少地方被人们用堤埝围成一圈一圈。堤内是阡陌相连的肥田沃土,种着茂密的庄稼,其中点缀着一些村落,恬静、美丽。洪水来时,湖面高于堤内的农田。可是由于有堤埝的保护,堤内的农业生产照常进行,丝毫不受影响。这种用堤埝围起来的圈子叫 If you have the opportunity to travel to Taihu Lake in Jiangsu Province, Dongting Lake in Hunan Province, Poyang Lake in Jiangxi Province, or Pearl River Delta in Guangdong Province, you will see an interesting picture: There are many places in lakes and rivers that are surrounded by dikes. In a circle. The embankment is a fertile land fertilized by landslides, planted with lush crops, dotted with villages, quiet and beautiful. When the flood came, the lake was above the farmland inside the embankment. However, due to the protection of dikes, the agricultural production in the dikes will continue as usual without any influence. This circle surrounded by dikes is called