DANIEL YERGIN: Whenever Soviet power was challenged in Eastern Europe, the response was very clear.It was tanks;it was the Red Army.

• 丹尼尔.；尤金(DanielYergin)：以前，在东欧，如果有谁胆敢挑战苏联强权的话，那结果再清楚不过了，必定是坦克、红军都一起来了。