We freed ourselves from the uncertainty of a hunter-gatherer existence 我们通过与大自然结盟
The only uncertainty concerns their scale. 只是不确定规模
It brought an end to the uncertainty of hunting and gathering. 它终结了不稳定的狩猎与采集生活
that there is uncertainty and tension. 以致整个场面充斥着不确定和紧张的气氛