兒子躺在沙發里看畫報,母親氣喘吁吁地走進屋說:“我買了一車煤,現在煤車停在橋那邊,拉不上來,你來幫媽推一下吧!”“咳,媽,你不懂科學,”兒子躺著不動,歪了歪頭說:“按照牛頓的慣性定律,你只要把車子退后20米,然后猛沖上去,車子就能過橋了。”
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