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- 问题详情：Achickenlaysanegg.Youfeelsleepy.Andatreelosesitsleaves.Allofthesethings,andmanymore,happeninacertainway,atacertaintimeeachdayoreachyear.Theytakeplacebecauseofsomethingcalledaninternalclock.Thewordinternalmeans“insideof”,andtheinternalclocki...
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