很显然，当今软件和系统交付的世界不再是1981年代状况，它正以惊人的速度在不断变化着。
Obviously, the world of software and systems delivery isn't what it was in 1981, and it continues to change at an astonishing pace.
交付时间是1970年代的这批“鬼怪”战机的机体已经接近寿命终点。
Delivered in the 1970s, the Phantoms' airframes are also nearing the end of their service life.
航空磁梯度仪在六十年代中期交付使用。
The airborne magnetic gradiometer came into use in the middle 1960s.
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