aquifer

n. 含水土层((含水量足以成为井水或泉水))

apron, apropos, apropos of, apse, apstream, apt, aptitude, aptitude test, aptly, aptness, Aqualung, aquamarine, aquaplane, Aquarian, aquarium, Aquarius, aquatic, aquatint, aqueduct, aqueous, aquiline, Arab, arabesque, Arabia, Arabian, Arabic, arabic numerals (also arabic figures), Arabist, arable, arachnid, arbiter, arbitrarily, arbitrariness, arbitrary, arbitrate, arbitration, arbitrator, arboreal, arboretum, arbour (US arbor),