The Chinese word "航线" (hángxiàn) is a compound noun formed by combining two meaningful characters: "航" (háng), which means "to navigate" or "to sail", and "线" (xiàn), which means "line" or "route". Together, they create a new, specific meaning through semantic composition, where "航" provides the domain of navigation (by air or sea) and "线" specifies the conceptual path or course taken. Thus, "航线" literally translates to "navigation line" and conventionally refers to a designated route for ships or aircraft, such as a shipping lane or an air route, demonstrating how Chinese frequently constructs terms by logically combining simpler, existing morphemes.