The Chinese word **污水** (wūshuǐ, meaning "sewage" or "polluted water") is a **modifier-noun compound** formed by combining the character **污** (wū), which means "dirty," "filthy," or "polluted," with the character **水** (shuǐ), meaning "water." In this structure, the first character **污** acts as an adjective that describes and specifies the type of the second character **水**, the noun. Therefore, the compound literally and logically translates to "dirty water," effectively creating a precise term for wastewater or contaminated water through this straightforward descriptive method.