Since the day of the air, the old frontiers are gone. When you think of the defense of England you no longer think of the chalk cliffs of Dover; you think of the Rhine.
自从天空出现的那天起，古老的边界就消失了。当你想到保卫英格兰时，你就不会再想到多佛的白垩悬崖;你会想到莱茵河。
标签
Frontiers