Nanotechnology is around us, which means that nanotechnology is closely related to our lives. Nanotechnology may be in our hair, in our eyes, in our nose or mouth, in our hands and feet, in the focus of our diseases, in our blood vessels or skin, in the drugs we take. Nanotechnology may be in our chairs, refrigerators, lamps, books and desks. Nanotechnology is everywhere in children. Let me give you some examples. Nano-technology plates keep them from breaking when they fall. Nanoparticle cups can keep warm and remove viruses. And nano-glass is a hundred times stronger than bulletproof glass. Many things around us are related to the technology there, such as China's books. Lesson 7, Book 2, Grade 4, nanotechnology used in refrigerators, stairs and airplanes. The refrigerator uses nano-coated stairs, a military airplane made of carbon nanotubes, also known as stealth airplanes. It is the most advanced, which is invisible to radar with nano-absorbing materials. Not only that, but finally, I want to say that nanotechnology was not first created by people, but was propped up by spider silk in nature.