-(用柱子等支撑而离开地面的)builtonstilts;bewithoutfoundations;overhead;aerial:
aerialcable;架空电缆
overheadpipe;架空管道
-(没有基础的)fanciful;impracticable;unpractical:
theorynotbasedonfacts;架空的理论
Theplanisimpracticable.这个计划是个架空的东西。
-(使徒具虚名)makesb.amerefigurehead;renderunfeasible