It is technology, whether steel, gunpowder, radio, GPS, or nuclear weapons, which have defined conflicts over the eras.

论钢铁、火药、、全球定位系统还是核武器，定义各个时代冲突的，正是这些技术。

While Skinner's idea was feasible, none of the feathered fighter pilots ever saw  action, as the scientists ultimately went with a radio-based echolocation system instead.

虽然斯金纳的想法是可行的，但没有一个有羽毛的战斗机飞行员行动，因为科学家们最终选择了基于的回声定位系统。