The advent of more than half a meter of carbon nanotubes has made it an important step towards application. The most important application of carbon nanotubes is to make "strong, tough, light and cheap" materials. Spider silk in natural materials It is the strongest, and the toughness of carbon nanotube fibers exceeds that of spider silk. Such materials are very important in the aerospace field. In addition, carbon nanotubes have a unique structure and conductivity that can be used at the nanoscale Electronic devices will be smaller and more sensitive than traditional electronic devices. However, the general carbon nanotubes have different lengths, different structure types and conductivity, and it is difficult to use them to produce devices with consistent structure and performance on a large scale. However, now The ultra-long carbon nanotubes overcome this problem and become a huge breakthrough. The text is intended to explain the carbon nanotubes? ['Application prospects.', 'Physical properties.', 'Structural performance.', 'Research breakthroughs.']