The term **住宅区** (zhùzháiqū), meaning "residential district/area," is a logical and semantically transparent compound formed by combining three characters: **住** (zhù, to reside), **宅** (zhái, house/home), and **区** (qū, area/zone). The first two characters, **住宅**, themselves form a compound noun meaning "residence" or "dwelling." This then acts as a modifier for the head character **区**, specifying the *type* of zone—thus creating the complete meaning of an "area of residences" or a designated living quarter. This structure exemplifies a common Chinese word-formation pattern where a descriptive compound modifies a core categorical noun.