The word "乘坐" is formed by combining two characters, "乘" and "坐", which both independently contain the core idea of using a vehicle or conveyance. "乘" carries the primary meaning of riding or ascending upon something (like a chariot, horse, or vehicle), while "坐" means to sit. When paired, they do not represent a sequence of actions but rather merge their overlapping semantic fields to create a single, reinforced concept meaning "to ride in" or "to travel by", specifically emphasizing the act of being a passenger sitting within a vehicle like a car, train, or plane. It is a logical, parallel compound where each part visually and conceptually contributes to the unified whole.