Steel structures have extensive applications and are the "steel backbone" of modern buildings. Super high-rise buildings such as the Shanghai Center Tower rely on steel structures to withstand strong winds and earthquakes. Large-span public buildings (the Bird's Nest, airport terminals) use them to achieve large-space without columns. Industrial plants and warehouses rely on their characteristics of quick construction and large spans. Bridge projects (the Hong Kong-Zhuhai-Macao Bridge) also extensively use steel structures to reduce weight and improve stability.