step-up gear 中文意思是什麼
step-up gear
解釋
升壓裝置-
Horology. corrected cycloidal toothing gears. step up gears. basic profiles. driving gear and driven gear
鐘表業.校準式擺線齒輪.增速齒輪.基本型面.主動輪和從動輪
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