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.

or rather, or so, oracle, oracular, oral, orally, orang-utan, orange, orange squash, orange-blossom, orange-coloured, orangeade, orate, oration, orator, oratorical, oratorio, oratory, orb, orbit, orch, orchard, orchestra, orchestra pit, orchestra stalls (US orchestra), orchestral, orchestrate, orchestration, orchid, ordain, ordeal, order, order-book, order-form, order-paper, ordered, ordering, orderliness, orderly, ordinal,