aqueduct

n.高架渠，渡槽，导水管，渠道

April Fool, April Fool's Day, apron, apropos, apropos of, apse, apstream, apt, aptitude, aptitude test, aptly, aptness, Aqualung, aquamarine, aquaplane, Aquarian, aquarium, Aquarius, aquatic, aquatint, aqueous, aquifer, aquiline, Arab, arabesque, Arabia, Arabian, Arabic, arabic numerals (also arabic figures), Arabist, arable, arachnid, arbiter, arbitrarily, arbitrariness, arbitrary, arbitrate, arbitration, arbitrator, arboreal,