第四: fourth导程: helical pitch; lead四导程记录器: four channel recorder四导程记录纸: four-channel recording paper四导程速示仪: four channels tachistoscope导程: helical pitch; lead◇导程检查仪 lead gauge; lead tester四导柱模架: ball slide die sets for press tools―four pillar die sets第四: fourth◇第四产业 quaternary economic sector四导柱上模座: holder for sliding guide die sets for press tools―punch holder for four pillar sets四导柱下模座: holder for ball slide die sets for press tools―die holder for four pillar setscf导程: cf leads导程角: angle of lead; lead angle曲导程: curved lead斜导程: bevel lead胸导程: chest lead胸导程, 心前导程: precordial leadscf导程, 胸左腿导程: cf leads胸（前）导程，心前导程: precordial leads半直接导程: semidirect leads变导程螺杆: variable lead screw标准导程: standard leads标准肢导程: standard limb leads大导程螺纹: steep-lead thread带引导程序: tape bootstraroutine单导程螺杆: single flighted screw
