第 8 单元 D 课

A tire is a rubber covering that fits around a vehicle's wheel. It provides grip on the road, helping the vehicle stay in control while moving. Tires are filled with air to cushion the vehicle, which makes the ride smoother and reduces the impact from bumps or rough surfaces. They come in different sizes and types depending on the vehicle and driving conditions. Tires also help with braking by providing friction when the brakes are applied. Without tires, vehicles would not be able to move safely or efficiently.

A greenhouse is a building made of glass or clear plastic that is used to grow plants in a controlled environment. It allows sunlight to enter, creating a warm space for plants to thrive, even in colder weather. Greenhouses are often used for growing flowers, vegetables, or tropical plants that need specific conditions to grow properly. They help protect plants from harsh weather conditions like frost or heavy rain while maintaining the right temperature and humidity levels. Greenhouses can range in size from small home structures to large commercial ones.

A front door is the main entrance to a building, typically located at the front of a home or commercial property. It serves as the primary access point for residents and visitors, often designed to be both functional and aesthetically pleasing. Front doors can be made from various materials, including wood, fiberglass, or steel, and are available in a wide range of styles, colors, and finishes to complement the overall architecture of the building. In addition to providing security and privacy, a well-designed front door can enhance the outside appearance of a property and make a positive first impression.