的确，当里根国家机场在我生活的，华盛顿特区建造时，周围有这样的标志。
It's true that when Reagan National Airport was built near Washington D. C. where I live, there were signs like this.
机场已加强保安，包括在华盛顿·里根国家机场。
Security has been stepped up at airports, including here at Washington's Reagan National airport.
机场已加强保安，包括在华盛顿·里根国家机场。
Security has been stepped up at airports, including here at Washington's Reagan National airport.
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