Hypersonic wind tunnels operating at very low densities were developed starting in about 1960.低密度超音速风洞大约开始发展于1960年.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.FEM FCT is used ...
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...
他肌肉发达，但是太胖了，没给人留下好印象。He was well-built, but too fleshy to be impressive.乌克兰的工业和农业都很发达。The Ukraine is strong both in industry and agricul-ture.在法国，欠发达的农村地区说方言。In France patois was spoken in rural, less developed regions....
Mother put a veto on our stayingout late.母亲不允许我们在外面呆到很晚才回来。There have been threats to veto any legislation that comes down the pike.他们威胁说要否决任何新出台的立法提案。The veto has been a traditional instrument of diplomacy for centuries...
研究结果表明,油酸钠是红柱石的最佳捕收剂.Results show that sodium oleate is the best collector for the mineral.研究了红柱石的可浮性及其与捕收剂烷基磺酸盐的作用机理.Study the floatability of andalusite and mechanism of which with alkyl sulphonate as collecter was acc...