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 ...
虽然重拍了好几次，导演罗恩·霍华德仍然对妮科尔的表现不满意。The director, Ron Howard, was dissatisfied with Nicole's response even after several retakes.这些照片不够清晰, 你最好得重拍.These photographs lack definition. You'd better have them taken again....
玛丽·安不想要孩子，至少现在不想。Mary Ann doesn't want to have children. Not right now, anyway.玛丽·安问他晚餐怎么样，他回答说：“糟透了。”Mary Ann asked him how dinner had been. "The pits," he replied.“玛丽·安还好么？”——“她很好，”她平静地说。"Is Mary Ann O.K?" — "She&...