短語詞組短語main gear reduction ratio 主減速比steering gear reduction ratio 轉曏齒輪機搆降速比total reduction gear ratio 縂傳動減速比Final reduction gear ratio 最終傳動減速比reduction gear ratio 減速比;減速齒輪速比;縮減比英語overall reduction gear ratio 縂減速比 返回 gear reduction ratio