Now of course we’ve seen a lot of geopolitical struggles between major world powers here on Crash Course, but this time there was the special added bonus that war could lead to the destruction of the human species.

现在我们当然已经在速成课程中看到了世界主要大国之间的许多地缘政治斗争，但这次有一个特别的额外好处， 即战争可能导致人类物种的毁灭。