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箭鱼是一种食肉性鱼类。这种鱼一般生活在太平洋、大西洋和地中海里,在我国东海和南海也有它们的踪迹。箭鱼的体形很大,身长约4米,体重达500千克。箭鱼头前的上颌突出很长,骨质坚硬,好像一支锋利的长箭。箭的长度约有 1.5米,几乎占了全身长度的1/3。科学家认为,箭鱼的锐利长箭并不是作为武器发展起来的,而是代表一种高速的流线形体,在海水里游泳,尖吻起了劈水破浪的作用,游速比普通轮船要快三四倍,每小时能前进120千米。
Swordfish is a carnivorous fish. The fish live in the Pacific Ocean, the Atlantic Ocean and the Mediterranean Sea, and they also have their tracks in the East China Sea and the South China Sea. The swordfish is very large, about 4 meters in length and weighing 500 kilograms. The upper jaw in front of the head of the swordfish protrudes very long and the bone is stiff, like a sharp long arrow. The arrow has a length of about 1.5 meters and accounts for almost 1/3 of the body’s length. Scientists believe that the sharp and long arrows of the swordfish are not developed as weapons, but represent a high-speed streamlined body. They swim in the sea water, and they play a role of drowning and breaking waves, and they travel faster than ordinary ships. Three or four times, 120 kilometers per hour can be advanced.