One day,a Swiss inventor named George de Mestral was walking in the woods.Later,he saw that many burrs had stuck to his wool pants.He wondered why they were hard to pull off. He looked at the burrs under a microscope,...One day,a Swiss inventor named George de Mestral was walking in the woods.Later,he saw that many burrs had stuck to his wool pants.He wondered why they were hard to pull off. He looked at the burrs under a microscope,and saw that each burr was made up of tiny hooks.展开更多
文摘One day,a Swiss inventor named George de Mestral was walking in the woods.Later,he saw that many burrs had stuck to his wool pants.He wondered why they were hard to pull off. He looked at the burrs under a microscope,and saw that each burr was made up of tiny hooks.
