他在1969年春天回到了故乡.He returned to his hometown in the spring of 1969.查尔斯王子于1969年受封为威尔士亲王.Prince Charles was invested with Prince of Wales in 1969.《佩兴丝与萨拉》一书最初于1969年出版时以《属于我们的地方》为名。"Patience and Sarah" was first published in ...
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 ...