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- 问题详情：AlittleboywasplayinginhissandboxonaSaturdaymorningehewasbuildingroadsandhousesinthesoftsand,hediscoveredalargestoneinthemiddleofthesandbox.Thelittleboypushedandpulled,buteverytimehethoughthehadmadesomeprogress,thestonetipped(倾斜)andthenfellb...
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