The word **光滑 (guānghuá)** is a compound adjective formed through the combination of two semantically related characters: **光 (guāng)**, meaning "light" or "bare," which conveys a sense of evenness and lack of roughness, and **滑 (huá)**, meaning "slippery" or "smooth to the touch." Together, they create a synergistic meaning where **光** emphasizes the visual quality of being polished or glossy, and **滑** emphasizes the tactile quality of being slick or frictionless. This formation follows a common pattern in Chinese where two characters with overlapping or complementary meanings are joined to express a single, more nuanced concept—in this case, describing a surface that is both visually sleek and physically smooth.