a bridge or viaduct carrying a waterway over a valley or other gap (架于山谷或沟壑上的)高架渠,桥管 ■an artificial channel for conveying water 人工水渠 ■(Anatomy)a small canal containing fluid (剖)导管
语源
mid 16th cent.: from obsolete French (now aqueduc), from Latin aquae ductus 'conduit', from aqua 'water' + ducere 'to lead'