两名男子在船桥甲板上扶着一架梯子不让它摇晃。Two men were on the bridge-deck, steadying a ladder.船桥是配备有先进的现代电子导航仪器.The bridge is equipped with sophisticated modern electronic navigation instruments.在其他时候, 使用船桥上的液压助力转向装置.At other times, the hyd...
The forebody design a key issue for hypersonic airbreathing vehicle.前体设计是吸气式高超声速飞行器设计的关键之一.It would reach hypersonic speeds -- five times the speed of sound.也就是说,要使飞机达到特超音速—即音速的五倍.hypersonic aerodynamics高超音速空气动力学rarefied...