模型 (mú xíng) means 'model' in the sense of a physical replica, scale representation, or abstract conceptual framework used to represent, study, or explain something real. The character 模 (mú) originally refers to a mold, pattern, or template—something that shapes or standardizes; 型 (xíng) means 'form', 'shape', or 'type'. Together, they emphasize a structured, representative form—not just appearance, but functional or theoretical correspondence. Models can be tangible, like a plastic dinosaur model used in paleontology education, or intangible, like a mathematical model predicting animal population growth.

This word is widely used in science, engineering, design, data analysis, and education. In biology and ecology, researchers build models of animal habitats or food webs to simulate environmental changes. Unlike the more casual term 样品 (yàngpǐn, 'sample') or the artistic term 雕塑 (diāosù, 'sculpture'), 模型 implies purposeful simplification for understanding, testing, or demonstration—not mere imitation or decoration.