Guo shoujing , a 13th-century scientist and hydrologist , is still revered for designing a network of lakes , weirs and artificial waterways .
13世纪的科学家兼水文学家郭守敬设计了湖泊网、围堰和人工运河,现在仍然受到人们的尊敬。
Until now , he 's been a lumberjack in oregon , a medical equipment manufacturer in minnesota , a hydrologist in colorado , a farmer in nebraska , to name just a few .