double saw

博客 ... doubler 倍压器，倍频器 double saw 复齿锯 double side razor blade 双面保险刀 ...

 double spine saw

博客 ... double side razor blade 双面保险刀 double spine saw 复齿锯 doublet ①双合透镜 ②双重线 ...

 double ine saw

... 兔形类 lagomorph 复齿锯 double ine saw; double saw; double spine saw; double tooth 复齿轮 compound gears; gear compound ...

 double tooth

... 兔形类 lagomorph 复齿锯 double ine saw; double saw; double spine saw; double tooth 复齿轮 compound gears; gear compound ...