The object was built in 1957-1961 because of the Cold War.
这个地方建于1957 - 1961年,当时为冷战而建。
In fact, the cave was built in 1957. It's used as a military installation at that time.
其实,这个山洞建于1957年,当时是用作军事设施的。
It was built in 1957 at the us National Bureau of Standards by a team led by Russell Kirsch.
它建于1957年在美国国家标准局的领导的一个研究小组的罗素基尔希。
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