Both animals and people were gasping for breath in the rarefied air.动物和人在稀薄的空气中都大口喘着气。rarefied hypersonic aerodynamics高超音速稀薄空气动力学rarefied-gas aerodynamics稀薄气体空气动力学...living at very high altitudes where the atmosphere is ...
If no agreement was reached, the army would step in.如果无法达成协议，军队将会介入。It was she who guided my every step in the working - class movement.是她在工人运动中指导我的每一步行动.We had to step in mud over our ankles.我们必须进入没脚的泥塘....