The plane exploded against a wall of the huge five-sided building where more than twenty thousand people worked.

飞机撞上巨大的五边形建筑物的堵墙上爆炸了，两万多人在那里工作。

Eventually he chose a design for the building as a geometric pentagon – a building with five sides – and that's why the building is called the Pentagon.

为这座建筑选择了个几何五边形的设计——座有五个面的建筑——这就是这座建筑被称为五大楼的原因。

The significance was that  that constant didn't depend on the shape itself, it could have been a square, or a cat, or the  pentagonal faces of our dodecahedron, whatever.

重要的是，这个常数并不取决于形状本身，它可能是个正方形， 或猫，或我们的十二面体的五边形面，等等。

The cathedral garth was a cloistered, pentagonal garden with a bronze postmodern fountain. Katherine was amazed how loudly the fountain's flowing water seemed to be reverberating in the courtyard.

大教堂的花园是个封闭的五边形花园, 里面有个青铜色的后现代喷泉。凯瑟琳惊讶于喷泉的流水似乎在庭院里回荡的声音。

Gawain's integrity and honor, symbolized by his heraldic device of a pentangle, are at stake in the Adventure of the Green Chapel, and what chiefly threatens to impair them is fear of the Green Knight's axe.

高文的正直和荣誉，以的五边形纹章装置为象征，在绿色教堂的冒险中处于危险之中，而威胁到们的主要是对绿色骑士斧头的恐惧。