基本解释拖板同根派生 planker相关词英汉例句sliding planker mechanism of bearing raceway lapping machine 轴承滚道超精研机滑移拖板机构Keywords sliding planker mechanism of bearing raceway lapping machine;lubrication;improved design; 轴承滚道超精研机滑移拖板机构;润滑;改进设计;planker更多例句