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Youmaynotpaymuchattentiontoyourdailyelevatorride.Manyof...
问题详情:Youmaynotpaymuchattentiontoyourdailyelevatorride.Manyofususealiftseveraltimesduringthedaywithoutreallythinkingaboutit.ButLeeGray,PhD,oftheUniversityofNorthCarolina,US,hasmadeithisbusinesstoexa...