grass-roots court
【机械工程】罗茨泵（罗茨增压泵）
Roots pump (Roots blower)
暂无补充释义。
相关词条
grass-roots unit
competent to work both at the top and at the grass roots
grass-roots
grass-roots organization【管理】
Roots blower【机】
pull up by the roots
(of cadres) stay at a selected grass-roots spot (for investigation and study)