weighting rod

加重杆

weighting down───使负重；给……加负担

lightning rod───避雷针

lightning rods───避雷针

fighting top───战斗桅楼

fighting word───容易引起对抗的话

fishing rod───n.（有绕线轮的）钓鱼竿

lighting on───偶然遇见（碰见，发现）；停落于

weighing down───体重下降

weighing in───加入比赛；比赛前量体重；参加辩论

Method Large diameter oil tube andweighting rodare adopted to decrease lifting resistance of crude oil and to increase lowering-in energy of the string.───方法采用增大油管直径和下加重杆技术，来减少油流上升阻力和增大杆柱下行动力。