The Chinese word **四肢** (sìzhī) is a compound noun formed through simple semantic combination: the character **四** (sì) means "four," and **肢** (zhī) means "limb." Together, they literally and logically denote the "four limbs" of the body—specifically the two arms and two legs. This follows a common pattern in Chinese word formation where a numeral quantifies a noun to create a specific, concrete concept.