The Chinese word **双臂 (shuāngbì)**, meaning "both arms," is formed through a straightforward compound word structure common in the language. It combines the numeral-measure word **双 (shuāng)**, meaning "a pair" or "double," with the noun **臂 (bì)**, meaning "arm." This creates a logical and semantically transparent **modifier-noun compound**, where the first character specifies the quantity or nature of the second. Therefore, the meaning is derived directly from its components: "a pair of arms." This method of word formation is highly productive in Chinese, allowing for clear and efficient creation of terms from existing morphemes.