And now, exactly 20 years after the Berlin Wall came down, we are well into the third phase – the debate over why the Cold War ended when it did and how it did.
时至今日，在柏林墙倒塌整整20年后，我们也就恰好进入了第三个阶段——关于冷战为什么结束以及如何结束等问题的讨论。