【纺织；造纸】双链状缝缝纫机【纺织；造纸】双链式缝纫机

Biotar lens【光】;double Gauss lens【光】

double flash electroretinogram

method of double exponential smoothing【统计】

double thread shoe border stitcher

double-ended tubular lamp

progressive double crossing-over(Weinstein 1936)

double alternate method

double-line spectroscopic binary【天】