第五单元 A 课

A bridge is a structure built to cross over a gap, such as a river, road, or valley, allowing people, vehicles, or animals to cross from one side to the other. Bridges are made from materials like wood, steel, concrete, or stone and come in various designs, such as arch, beam, or suspension. They can range in size from small footbridges to large, multi-lane highway bridges. Bridges are important for transportation, connecting different areas and making travel easier and safer. They are also often considered engineering landmarks.

A skyscraper is a very tall, multi-story building that is designed for offices, apartments, or other purposes. These buildings are typically made of steel and glass, allowing them to reach great heights while remaining strong and stable. Skyscrapers are often found in large cities and are considered symbols of modern architecture and urban development. They offer space for many people or businesses and have features like elevators to move quickly between floors. Skyscrapers are designed to maximize space in crowded areas where land is limited.

A stadium is a large, open or partially enclosed venue designed for sports, concerts, or other events that require a large audience. It typically features seating for thousands of people, with a field or stage in the center. Stadiums are commonly used for events such as football games, concerts, or athletic competitions. They are designed to provide good visibility for spectators and often include facilities like restrooms, food stands, and VIP areas. Some stadiums also have roofs to protect spectators from the weather.

A tower is a tall, slender structure that can either stand independently or be part of a larger building, such as a castle, church, or palace. Towers are usually much taller than they are wide and can be used for various purposes, such as observation, defense, or housing bells. They are often designed to stand out and can be made from materials like stone, brick, or metal. Towers are commonly seen in both historic and modern architecture, symbolizing strength, height, or grandeur. Some towers, like clock towers, also serve as landmarks in cities.

A tunnel is an underground passage that is typically built for transportation, such as roads, trains, or utilities. It can also be used for water flow or as a way to bypass natural obstacles like mountains or rivers. Tunnels are usually dug or drilled through the earth or rock, and they can vary in length, width, and purpose. They are often lined with concrete or steel to prevent collapse. Tunnels are an essential part of infrastructure, providing safe and efficient routes for people and goods. Some tunnels are open to the public, while others are used only for specific purposes, like mining or utilities.

A ticket is a small paper or electronic pass that allows a person to travel on a bus, train, or other forms of public transportation, or to attend an event, such as a concert or sports game. It shows that the person has paid the required amount for entry or travel. Tickets often include details like the date, time, and location, and they help organizers or transportation services keep track of who is traveling or attending. Passengers or attendees are usually required to show their ticket before entering or boarding.