This story happened in Greece on the Mediterranean coast a long time ago. In the south of Crete, there is a beautiful fishing village. In front of the village is a sea of Wang Yang. There are dozens of fishermen in the village. Men, women and children in the village can dive skillfully. They have been fishing and collecting pearls for generations.
One day, the king sent a team of officers and men, armed with all kinds of weapons, and surrounded the small fishing village angrily. A potbellied guy conveyed the king's order: give the villagers three days to hand over ten pounds of pearls, and if they fail to do so, all the men in the village will be executed. The villagers all know that pearls grow on the bottom of the sea, and pearl berries are difficult to salvage. Usually people salvage a hundred pearls from the bottom of the sea, but they can't pick out a few pearls. Therefore, it is more difficult to complete the task than to ascend to heaven.
The three-day deadline soon arrived, and the fierce and brutal officers and men gathered all the people in the village. They tied up all the people and prepared to push them into the sea. At this critical moment, a 18-year-old youth stood up and said to the officers and men, "Please give me another day, and I promise to collect ten pounds of pearls." The young man's name is Gracchus, and he is a professional diver. The officers and men agreed to his request.
Most pearls grow on the seabed 20 to 30 meters deep. In ancient times, there were no advanced diving equipment and oxygen bags, so people could only hold their breath and dive to the bottom of the sea to collect. Greg rowed a small wooden boat to the seaside. In order to reduce the diving time, he jumped into the water with a big stone in his arms. A few minutes later, he appeared with a big green thing in his arms. He held up a green thing and said to the officers and men, "I met the sea dragon king when I was looking for pearls at the bottom of the sea." I said I was the special envoy of the kingdom of Crete, to meet the sea dragon king. The sea dragon king was very happy and specially asked me to give this' gift' to the king and told him that putting it on the throne would make the king live longer. "
The officers and men took Glagus's words with a grain of salt and quickly brought the gift into the palace. When the king saw the "gift" sent by the Sea Dragon King, he was very happy and immediately summoned Gracchus. Grages buried the green "gift" in the sand, dehydrated it, turned it into a white honeycomb and put it on the throne. The king is very soft and comfortable to sit on. The king was very happy and released all the villagers.
Children, guess what is the "gift" that the "Sea Dragon King" gave the king? By the way, it's a sponge.
Sponges are invertebrates in the ocean. There are many small holes in the body, which communicate with the pipes in the body. Because seawater flows through pores, sponges can absorb nutrients from them. What turns white after dehydration is its skeleton, called sponge silk.
Sponges can have many uses. Because of its strong water absorption, good thermal insulation, softness and elasticity, it is widely used in all aspects of industrial and agricultural production and people's life.
Sponge can be used as packaging material to wrap ceramics, glass, handicrafts, household appliances, precision instruments, medical devices and so on. , to ensure the safety of these precious fragile items in the process of handling, to prevent deformation, breakage and damage.
As a sound insulation material, sponge can be used for indoor decoration of conference rooms, studios, recording studios and theaters, which not only ensures better indoor sound effect, but also reduces the impact of noise on the surrounding environment.
Sponges are also used in medicine. They are soft and effective in stopping bleeding when dressing wounds on the battlefield. It can also be used as a medicine for treating rheumatic joint pain. Athletes wear knee pads made of sponge during training and competition, which can protect joints from injury.
Transparent sponge; The role of Kyrgyzstan is well known. Sponge itself has a strong adsorption capacity. Its pores are like countless miniature vacuum cleaners, which can automatically adsorb dirt on the surface of objects and remove oil stains, dirt and dust. The effect is excellent, which is both economical and environmentally friendly.
Adding flame retardant in sponge foaming can also play a role in fire prevention and flame retardant. By the way, children's headphones often have sponge covers, which can protect the eardrum, reduce the squeezing feeling of the headphones on the ears, prevent the headphones from slipping and enhance the sound effect. But many of the items mentioned above are artificial sponges, which are made by people according to the characteristics of sponges. Children, look, Spongebob has many uses! In fact, there are many things you don't know about the underwater world. I hope you study hard to explore and discover the mysterious ocean world.