常見例句雙語例句Variable-bore rams are designed to seal a wider range of pipe diameters, albeit at a sacrifice of other design criteria, notably element life and hang-off weight.設計了變孔眼直徑的閘板去密封更大范圍內(nèi)的管柱直徑，雖然犧牲了其它設計的標準、顯著的部件壽命和懸重。www.infopetro.com.cn 返回 hang-off rams