Unit 6When was it invented?九年级(全)n.鞋跟;足跟鞋跟;足跟/hi:l/n.勺;铲子勺;铲子/sku:p/n.电;电能电;电能/,ilektristi/n.样式;款式样式;款式/stail/n.高兴;愉快高兴;愉快/ple(r)/n.(=zip)拉链;拉锁拉链;拉锁/zip(r)/adj.每日的;日常的每日的;日常的/deili/Wordsandexpressionsheelscoopelectricitystylepleasurezipperdaily有道理有道理n.网站网站/websait/n.先锋;先先锋;先/,paini/,/,painir/v.列表;列清单列表;列清单/list/n.名单;清单名单;清单v.替代;说到替代;说到/menn/haveapointwebsitepioneerlistmentionWordsandexpressionsWhataretheFourGreatInventionsinancientChina?Do you know?paper-making造纸术造纸术compass指南针指南针printing印刷术印刷术gu