The word **加长** (jiācháng) is a straightforward compound verb formed by combining the verb **加** (jiā), meaning "to add" or "to increase," with the adjective **长** (cháng), meaning "long." This follows a common grammatical structure in Chinese where a verb modifies or acts upon an adjective to specify an action that results in a new state. Therefore, the literal and functional meaning is "to add length," or in natural English, **"to lengthen"** or **"to extend."** It is a logical and transparent formation where the semantic sum of its parts clearly conveys the intended action.