When we withdraw into underground dwellings, the surface ground now occupied by cities can be turned over to park and to wilderness for recreation.

当我们撤到地下居所时，现在由城市占据的地面便可让位于公园和荒野，供人们休闲娱乐。

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Well, actually when I came back -- when we withdraw from Tahar, we walked by foot maybe more than 100 miles.

CNN: Transcript of John Walker interview

Context has to do with why we wake up smiling when sunlight creeps into our bedroom and why we shiver in the cold or withdraw our hands from fire.

FORBES: Age of Context Draft Introduction