![Youmaynotpaymuchattentiontoyourdailyelevatorride.Manyof...]( "Youmaynotpaymuchattentiontoyourdailyelevatorride.Manyof...")
- 問題詳情：Youmaynotpaymuchattentiontoyourdailyelevatorride.Manyofususealiftseveraltimesduringthedaywithoutreallythinkingaboutit.ButLeeGray,PhD,oftheUniversityofNorthCarolina,US,hasmadeithisbusinesstoexaminethisoverlookedformofpublictransport.Heisknowna...
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