n.五边形，五角形，五角大楼(指美国国防部)

原形：pentagon复数：pentagons

The Pentagon is the headquarters of the United States Department of Defense.
五角大楼是美国国防部的总部。
The attack on the Pentagon on September 11, 2001, was a tragic event in American history.
2001年9月11日对五角大楼的袭击是美国历史上的一个悲剧事件。
Inside the Pentagon, you can find a maze of corridors and offices.
在五角大楼内部，你可以找到一片错综复杂的走廊和办公室。
The Pentagon's budget is one of the largest in the world.
五角大楼的预算在世界上是最大的之一。
The Defense Secretary holds regular meetings with top brass at the Pentagon.
国防部长定期与五角大楼的高级军官举行会议。
The Pentagon has a five-sided structure, which gives it its name.
五角大楼因其五边形的结构而得名。
The decision to deploy troops abroad was made at the highest levels within the Pentagon.
派遣部队到国外的决定是在五角大楼的最高层作出的。
The Pentagon houses not only military officials but also civilian employees.
五角大楼不仅有军事官员，还有文职人员。
The architecture of the Pentagon is an iconic symbol of American military power.
五角大楼的建筑是美国军事力量的标志性象征。
Rumors were circulating that there would be a major reshuffle of top Pentagon officials.
有传言说，五角大楼的高层官员将进行重大调整。