魚究竟是怎样游动的?这个看來簡单的問題,几世纪以来一直沒有获得完滿解决。一般认为,魚是通过搖动它的櫓一般的尾巴和划动它的桨一般的鰭来游动的。但是,生物学家发現沒有尾巴和鰭的魚,如鰻魚游动起来,跟有尾巴和鰭的魚一样輕快。科学家还发現,魚和海洋哺乳动物(如海豚)的肌肉力量不大,达到的游动速度却相当高。这些发現 How does the fish swim? This seemingly simple problem has not been satisfactorily solved for centuries. It is generally believed that the fish swims by shaking its pecking tail and paddling its fins. However, biologists found that fish without tails and fins, such as squid swimming, were as light as fish with tails and fins. Scientists also found that fish and marine mammals (such as dolphins) have little muscle strength and achieve very high swimming speeds. These findings