It has made great contributions to the progress and development of world civilization, so do you know who these inventors are?

Du Fu's poems are also called Du Gongjun, and people call him Zhao Fu. He was a counselor during the reign of Emperor Guangwu and one of the four great inventors in ancient times. When he was a magistrate in Nanyang, he made a mechanical drainage pipe that used a hydraulic blower to blow cast iron. The air is forced into the cast iron furnace by hydraulic stirring blower equipment, and the drainage device is used instead of manpower to drain water, which improves the labor productivity of the people, and is mainly used to repair ponds and open up wasteland, making great contributions. The output value of local water conservancy and agricultural production has increased, and people's lives have become richer.

During the Qin and Han Dynasties, the irrigation in the Yangtze River basin was most remarkable in Tangbai River, a tributary of Hanshui River, which was developed in Nanyang, Dengxian, Tanghe, Xinye and other places in Henan Province. Tangbaihe area is an eroded alluvial plain with an annual rainfall of about 900 mm and a mild climate, which is suitable for crop growth. It was developed earlier here, and by the middle of the Western Han Dynasty, the economy was quite developed. Farmland water conservancy has made great progress in the late Western Han Dynasty. During the period (48-33 BC), Nanyang Taishou Zhao made a special contribution to local water conservancy and agricultural production, so he was well received by local people and was called "Zhao Fu". During the Eastern Han Dynasty, Nanyang water conservancy flourished further, and Du Fu's poems also made great achievements in this respect, which promoted the development of local agricultural production. In history, Du Fu wrote a poem, "Plough the pond, expand the soil, and the county is richer than the room".