![Howdidpeopletellthetimebeforeclockswereinvented?Atfi...]( "Howdidpeopletellthetimebeforeclockswereinvented?Atfi...")
- 問題詳情： Howdidpeopletellthetimebeforeclockswereinvented?Atfirst,theancientpeoplelookedupatthesunandcouldtellitwasthemiddleofthedaywhenthesunwasdirectlyoverheadinthesky.Theyalsoknewwhenitwasmorningorevening.Later,theEgyptiansusedsticks.Thesestic...
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