arch

n.拱

arabic numerals (also arabic figures), Arabist, arable, arachnid, arbiter, arbitrarily, arbitrariness, arbitrary, arbitrate, arbitration, arbitrator, arboreal, arboretum, arbour (US arbor), arc, arc lamp, arc light, arc welding, arcade, arcane, arch-, arch-enemy, archaeological, archaeologist, archaeology, archaic, archaism, archangel, archbishop, archbishopric, archdeacon, archdeaconry, archdiocese, archduke, archer, archery, archetypal, archetypally, archetype, archipelago,