refine

v.精炼，精制，提纯；使有教养，使文雅

reexport, ref, reface, refectory, refer, refer oneself to, refer to, refer to ...as, refer to sb. as, refer to...as, referable, referee, reference, reference book, reference marks, referendum, referent, referral, referring, refill, refined, refinement, refiner, refinery, refit, reflate, reflation, reflationary, reflect, reflect on, reflection, reflection (Brit also reflexion), reflective, reflectively, reflectivity, reflector, reflex, reflex angle, reflex camera, reflexion,