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问题详情：Amiddle-agedman,XuShijie,fromKaifengisapedicab(三轮车）driver,orrather,atourguide.Overthepast15years,hehasservedhundredsofforeigntourists.HetoldthemstoriesaboutKaifenginEnglish.       ①...

问题详情：   PreparingCitiesforRobotCarsThepossibilityofself-drivingrobotcarshasoftenseemedlikeafuturist’sdream,yearsawayfrommaterializingintherealworld.Well,thefutureisapparentlynow.TheCaliforniaDe...