Swordfish is also called swordfish. It is named because its upper jaw is flat at the top and bottom, thick in the middle and thin on the sides, like a sharp sword. But because of its fast speed, it is like an arrow leaving the string, so it is called swordfish. Animals living in water have different swimming speeds due to their different types and lifestyles. In 1967, the "Nature" magazine of the Soviet Union (now the CIS) published a "Speed Comparison Table of Animals in the Sea." Among them, cetaceans: 55 km/h for baleen whales, 50 km/h for fin whales, 65 km/h for killer whales, and 22 km/h for sperm whales; 22 km/h for pinnipeds: fur seals 354 km/h, and 18-20 km/h for walruses; Fish: swordfish 130 km/h, sailfish 120 km/h, flying fish 65 km/h, shark 40 km/h; cephalopods: squid 41 km/h, golden squid 26 km/h, short octopus 15 km/h. It can be seen from this statistical table that swordfish swims the fastest.
Why does the swordfish swim at such a high speed? It turns out that it has a very typical streamlined body with a smooth surface, a long and pointed upper jaw, and a strong and powerful tail peduncle that can generate huge propulsion. As it swims forward at high speed, its long, spear-like jaws serve to cut through the water. The swordfish moves at a high speed of 130 kilometers per hour, and its hard upper jaw can pierce the thick bottom of a boat!
In the Museum of London, England, there is a piece of the bottom of a ship that was pierced by a swordfish "sword". The planks on the bottom of the ship are 50 centimeters thick.
The swordfish's fast-swimming size provides aircraft designers with a living blueprint. The designer imitated the shape of a swordfish and installed a long "needle" in front of the aircraft. This long "needle" pierced the "sound barrier" generated during high-speed advancement, and thus the supersonic aircraft was born. The emergence of high-speed aircraft is also a great success of bionics.
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