记忆方法
将“pentagon”分解为“pen”和“tagon”。想象一支笔（pen）正在画一个五边形（五边即“pent”），因此“pentagon”指的是五边形。通过视觉联想，容易记住这个单词表示“五角形”。
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词族 · pentagon
词形变化
中文词源
pentagon 五边形，五角形
penta-,五，-gon,边，角，词源同knee,heptagon.
英语词源
- pentagon
-
pentagon: see five
- pentagon (n.)
- plane figure with five angles and five sides, 1560s, from Middle French pentagone or directly from Late Latin pentagonum "pentagon," from Greek pentagonon, noun use of neuter of adjective pentagonos "five-angled," from pente "five" (see five) + gonia "angle" (see -gon). The U.S. military headquarters Pentagon was completed 1942, so called for its shape; used allusively for "U.S. military leadership" from 1945. Related: Pentagonal.
In nature, pentagonal symmetry is rare in inanimate forms. Packed soap bubbles seem to strive for it but never quite succeed, and there are no mineral crystals with true pentagonal structures. But pentagonal geometry is basic to many living things, from roses and forget-me-nots to sea urchins and starfish. [Robert Bringhurst, "The Elements of Typographic Style," 1992]
权威例句
- 1. The Pentagon will give preference to companies which do business electronically.
- 美国国防部将会优先考虑那些能够进行电子商务的公司。
- 2. Pentagon spokes-man Williams says those talks are coming along quite well.
- 五角大楼发言人威廉斯说那些会谈进展得相当顺利。
- 3. A group of people made a circle around the Pentagon.
- 一群人在五角大楼四周围成一圈。
- 4. The Pentagon says bad weather is hampering the allied air raids.
- 五角大楼称恶劣天气妨碍联合空袭。
- 5. A Pentagon spokesman refused to comment.
- 美国国防部发言人拒绝评论。