Hints: 本期學(xué)習(xí)的字源：pent-=five五 U.S. Department of Defense javelin 1,500-meter 單詞不需要大寫，單詞與例句或不同詞條之間換行即可。 注解中詳細介紹了單詞的拆分與釋義，是學(xué)習(xí)字源分析的重中之重！一定記得聽寫后來看注解！
pentangle pentagon The U.S. Department of Defense is housed in a building in the shape of a pentagon. pentathlon 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.
The U.S. Department of Defense is housed in a building in the shape of a pentagon. 美國國防部位于一棟五角形建筑中。 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. 五項運動的參賽者要參加跳遠、標(biāo)槍、200米短跑、鐵餅和1500米長跑。