double fin双立尾doubleadj.双重的；成双的；两倍的v.翻一番；使 ... 加倍n.两倍；双份double-ply hosiery双层袜double-phase steel双相钢double water sources双水源double-field model双场模型Double -array Trie双数组Triedouble-socket pipe双承接口double monochromator双单色仪double SB modulation双边带调制double-sided media双面媒体double match measure双匹配度