远古时候,人类的祖先为了克服江河湖泊的障碍,取得水上行动的自由,开始千方百计地模仿鱼类。先是模仿鱼类的体形“刳木为舟”,继而又仿照鱼的胸鳍和尾鳍制成双桨和单橹。后来独木舟满足不了需要,人们又进一步仿照鱼类制造更大更复杂的木船。19世纪后期,人们仿照鱼类的形状发明了鱼雷,制造了鱼雷快 In ancient times, in order to overcome the obstacles of rivers and lakes and to gain the freedom of water operations, human ancestry began to try every possible means to imitate fish. First imitate the fish’s body shape, “Alder as a boat,” and then follow the fish’s pectoral and caudal fin made double scoop and single 橹. Later, canoes can not meet the needs, people are further imitating the fish to create larger and more complex wooden boat. In the late 19th century, people invented torpedoes in the shape of fish and made torpedoes fast