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   Howdidpeopletellthetimebeforeclockswereinvented?Atfi...
問題詳情:   Howdidpeopletellthetimebeforeclockswereinvented?Atfirst,theancientpeoplelookedupatthesunandcouldtellitwasthemiddleofthedaywhenthesunwasdirectlyoverheadinthesky.Theyalsoknewwhenitwasmorni...
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