gravity bed重力床gravityn.重力；庄重；严重；严肃gravity oriented satellite重力定向卫星gravity disturbance vector重力扰动矢量gravity field of the barth地球重力场gravity-aided navigation重力辅助导航gravity-settling culture重力沉降(澄清)培养Gravity and magnetic force重、磁力gravity field of the earth地球重力场gravity irrigation district自流灌区gravity-flow concentrator重选机gravity of Yinchuan Station银川台重力