/ˈɔ:bɪtl ||; ˈɔrbɪtḷ/adj1 (used about a road) built around the outside of a city or town to reduce the amount of traffic travelling through the centre （指道路）环城的，环形的
2 connected with the orbit of a planet or another object in space 与行星或太空物体的轨道有关的
orbital noun [C] [usu.sing]