external honing英 [ɪkˈstɜːnl ˈhəʊnɪŋ]美 [ɪkˈstɜːrnl ˈhoʊnɪŋ]外圆珩磨机械双语例句Study on Electric Casting Processing of Straight External Honing Gear电铸直齿外珩轮的工艺研究