The original Indo-European word for five began with a p sound as reflected in the Greek word penta, which survives in words like pentagram and pentagon.
原始的印欧语系中表示“五” 的单词以 p 开头的, 这一点反映在希腊语单词 penta 中,这个词在 pentagram(五角星)和 pentagon(五边形)等词中得以保留。
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.
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.
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.
If a scientist gives you a piece of paper with five squares and a pentagon on there, you, as a human, will recognize that the pentagon doesn't belong, and then you'll high-five the scientist.
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.
Steroids can be naturally occurring or synthetic, but what all steroids have in common is a molecular structure that consists of a base of four rings made of 17 carbon atoms arranged in three hexagons and one pentagon.