字典網>> 英漢字典>> D開頭詞條>>double helical spur gear的意思 漢英字典double helical spur gear中文翻譯：【化】 人字齒輪字典網 相關詞條：double curve turnout in oppositi-on directior double-word constant double consciousness double pleurisy double-throw switch double-toggle double contrast enema double-length numeral double value double-pulsing station