It took another three decades before a flying sub appeared for real.
又过了三十年，一架真正的飞潜艇才出现在人们眼前。
Nothing changed for three or four decades.
三四十年间没有任何变化。
For nearly two and a half decades, BesGas Three remained hidden.
大概25年的时间里贝斯平第三气体精炼厂保持着隐藏的状态。
But for the first three decades of cad this was not the case.
但是CAD的头三十年却不是这样的。
But for the first three decades of cad this was not the case.
但是CAD的头三十年却不是这样的。
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