The Chinese word **过滤 (guòlǜ)**, meaning "to filter," is a perfectly logical compound formed by combining two semantic elements: **过 (guò)**, which means "to pass through," and **滤 (lǜ)**, which means "to strain" or "to filter." Together, they create a vivid verbal image of a substance **passing through** a medium (like a sieve, membrane, or system) **in order to be filtered**, thereby separating impurities or selecting specific components. This formation is typical of modern Chinese, where two characters with related meanings are joined to precisely define a technical or process-oriented concept, widely used in contexts from chemistry and engineering to computing and everyday life.