unit2reading高三英语课件
日期：2010-05-16 05:50
thefleetssetsailfromtheSouthChinaSeaacrosstheIndianOceantotheRedSea，sevenlargetreasurefleetssailedwestwardsonvoyagesoftradeandexplorationUnderthecommandofZhengHe，Unit2CrossingLimitsWhatisthedifferencebetweenanavigatorandanexplorer?NavigatorseanauticalinstrumentsfindnewislandsorcontinentsNavigatorissomebodywhofindsthepositionandplotsthecourseofashipusingmapsandinstrumentsExplorerlanduseofcompassandlandmarksfindnewplaceswithinanalreadyidentifiedislandorcontinentExplorerissomebodywhotravelsintoorthroughaplaceinordertolearnaboutitVeryoftennavigatorsarealsoexplorersIntheyearbetween1405and1433，andthentraveledfurthersouth，discoveringtheeasterncoastofAfricaHerenewedrelationswiththeKingdomsoftheEastAfricancoastOneAfricankingsenttheMingemperoraroyalpresent:twogiraffesAbout700yearsagoayoungtraderfromItalytookalongtriptoCathayCathayisknownasChinatodayHewentwithhisfatheranduncle，whohadtraveledthereoncebeforeTheystayedinChinaforabouttwodecadesTheyoungmansnamewasMarcoPolo，
查看全部