ordeal

n.苦难经历，(尤指对品格、耐力的)严峻考验

orangeade, orate, oration, orator, oratorical, oratorio, oratory, orb, orbit, orbital, orch, orchard, orchestra, orchestra pit, orchestra stalls (US orchestra), orchestral, orchestrate, orchestration, orchid, ordain, order, order-book, order-form, order-paper, ordered, ordering, orderliness, orderly, ordinal, ordinance, ordinarily, ordinary, ordinary level (also O level), ordinary seaman, ordination, ordnance, Ordnance Survey, ordure, ore, organ,