This paper produces a new way of grinding the hole of a helix flute Archimedes spiral hob: a bob is orientated in three tapers.是什么意思_This paper produces a new way of grinding the hole of a helix flute Archimedes spiral hob: a bob is orientated in three tapers.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句