Double low双低doubleadj.双重的；成双的；两倍的v.翻一番；使 ... 加倍n.两倍；双份double error detecting code[计] 双错检测码double reheat steam turbine二次中间再热式汽轮机double-deck rolling stock双板滚动槽double-stranded DNA virus双链DNA病毒double tube parallel tunnel双孔平行隧道double entry book-keeping复式记帐double-reversible tramway双往复式架空索道double-structure encoding双重结构编码double commutator generator双整劣发电机double current transmission双向电流传送