The word "建设" is formed by combining the characters "建" and "设". "建" primarily means to build or construct, often referring to physical structures or establishment. "设" means to set up, establish, or design, focusing on the planning aspect. Together, they create a compound word where "建" contributes the action of building and "设" adds the notion of planning or setting up, resulting in the meaning of construction or development, typically for projects like infrastructure.