Cách sử dụng
A ceiling is the top part of a room or building. It is usually flat and made of concrete, wood or other materials, and is attached to the walls or roof of a structure. It helps to enclose the space and provide insulation from the outside air. The term "ceiling" can also be used to describe the maximum limit or level of something, such as a salary or price. For example, if a company offers a job with a salary ceiling of $50,000 per year, that means the pay cannot exceed that amount.