Velcro & Zipper

• 来源期刊: 数理天地:初中版
• 学科: 教育
• 关键词: Velcro ZIPPER
• 年，卷（期）: sltdczb_2019,（1）
• 页码范围: 48-49
• 页数: 2页
• 分类号: G634.41

摘要

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.