奚根勇现代科学技术上的许多伟大发明和创造,在自然界往往都有着类似的雏形。人们当年制造潜水艇、飞机和降落伞,就受了鱼、鸟、蒲公英的启示,近几年来,造船家和航海家从鱼的身上又学到了许多有益的东西,其中有些已经在实际应用中获得了很大的成功。“鱼尾”推进器我们平常看见鱼在游泳时鳍总是不停地摆动,就以为鱼象人游泳时用手拨水一样,是用鳍拨水使鱼前进的。但是,如果我们仔细观察的话,就发现鳍的主要动作不是前后摆动,而是上下摆动。原来它有着别的功用:鱼身在前进时,可以使身体浮起来或者沉下。鳍叶向下压,身体便浮起来;鳍叶向上提,身体便沉下去。 Yu Genyong’s many great inventions and creations in modern science and technology often have similar embryonic forms in nature. When people made submarines, planes and parachutes that year, they were inspired by fish, birds and dandelions. In recent years, shipbuilders and navigators learned many useful things from the fish, some of which have been obtained in practical applications. A great success. “Fishtail” propellers We usually see fish fins constantly swinging while swimming. They think that like a man dials water while swimming, he uses his fins to pour water into the fish. However, if we look closely, we find that the main action of the fin is not to oscillate back and forth but to swing up and down. It turned out to have other functions: when the fish is moving forward, it can make the body float or sink. The fins press down and the body floats; the fins lift up and the body sinks.