阀门要靠蒸汽的力量冲开.The valves are to be blown out by the force of vapour.靠蒸汽推动的轮船在密西西比州更是大受欢迎.Steam - driven paddleboats are especially popular on the Mississippi.这艘船靠蒸汽驶进了太平洋.The ship steamed off into the Pacific....