入门字
	 
	pentangle (n.) 五角形
	 
	pent/ angle
	five/ angle
	 
	进阶字
	 
	1. pentagon (n.) 五角形
	 
	pent/ agon
	five/ angle
	 
	The U.S. Department of Defense is housed in a building in the shape of a pentagon.
	美国国防部位于一栋五角形建筑中。
	 
	2. pentathlon (n.) 五项运动
	 
	pent/ athl/ on
	five/ sports/ 名词字尾
	 
	In the pentathlon, a contestant takes part in the long jump, the javelin throw, the 200-meter dash, the discus throw, and the 1,500-meter run.
	五项运动的参赛者要参加跳远、标枪、两百公尺短跑、铁饼和一千五百尺长跑。