arbitrary

a.任意的，武断的；专断的，专横的

aquarium, Aquarius, aquatic, aquatint, aqueduct, aqueous, aquifer, aquiline, Arab, arabesque, Arabia, Arabian, Arabic, arabic numerals (also arabic figures), Arabist, arable, arachnid, arbiter, arbitrarily, arbitrariness, arbitrate, arbitration, arbitrator, arboreal, arboretum, arbour (US arbor), arc, arc lamp, arc light, arc welding, arcade, arcane, arch, arch-, arch-enemy, archaeological, archaeologist, archaeology, archaic, archaism,