Fourth-graders understand it -- nine years old -- and they handle that and use that to understand how to, not follow -- at first they do -- the paths to power and destruction, the path to war.
四年级，9岁的孩子可以理解 可以学习如何灵活应用 刚开始他们只是照着做 刚开始他们 走上争权夺利和毁灭性的 战争之道