Study of Tooth Profile Equation of Negative-rake-angle Hardening Surface Double Circular Arc Gear Hob and the Design of Its Secondary Cutter Profile是什么意思_Study of Tooth Profile Equation of Negative-rake-angle Hardening Surface Double Circular Arc Gear Hob and the Design of Its Secondary Cutter Profile在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句