orbital
adj
of an orbit (星体的或人造飞行物体的)轨道的; 势力范围的
a spacecraft´s orbital distance from the earth 航天器的远地轨道距离
an orbital motorway, ie round the outside of a city 外环高速公路. -- n road passing round the outside of a city (城市的)外环路
Take the London orbital. 走伦敦外环路.