Houses built before 1939 use about 50% more energy per square foot than those built after 2000, mainly due to the tiny cracks and gaps that expand over time and let in more outside air.
Traditional armor strategies use successive layers of armor with airgaps to mitigate the blast.
传统装甲策略采用连续多层装甲,利用间隙气体吸收爆炸冲击波。
3
But time and time again, the so-called "airgaps" between classified and public networks have been bridged, largely through the use of discs and removable drives.