The word 强壮 is formed by combining two individual characters, each contributing a related aspect of meaning to create a unified concept. The first character, 强, conveys the idea of being strong, powerful, or forceful, often in an abstract or resilient sense. The second character, 壮, signifies robust, sturdy, and physically strong, with a connotation of healthy vigor and solid build. Together, they reinforce and complement each other, merging notions of potent strength and solid physicality to form a single, more vivid idea of overall powerful and robust strength.