对数双螺线 logarithmic double spiral

双曲螺线 [数] Hyperbolic spiral ; [数] reciprocal spiral ; Hyperbolische Spirale

双螺线结晶器 double helix crystallizer ; crystallizer ; double helix

双线螺纹 double start thread ; thread ; double

双宫螺旋线虫 helicotylenchus dihystera

切线双螺杆挤压机 tangent twin screw extruders

双角螺旋线虫 Helicotylenchus digonicus

双螺旋线 [数] Double Helix

双曲线式螺杆泵 hyperbolic screw pump