Ordnance Survey

(Brit) (government department that prepares) accurate and detailed maps of Great Britain （英国的）全国地形测量（局）: [attrib 作定语] an Ordnance Survey map 英国全国地形测量局绘制的地图.

orchestration, orchid, ordain, ordeal, order, order-book, order-form, order-paper, ordered, ordering, orderliness, orderly, ordinal, ordinance, ordinarily, ordinary, ordinary level (also O level), ordinary seaman, ordination, ordnance, ordure, ore, organ, organ-grinder, organ-loft, organdie (US also organdy), organic, organic chemistry, organically, organically-grown, organisation, organise, organism, organist, organization, organization, organisation, organizational, organizational, organisational, organize, organize, organise,