英语阅读给个标准答案If a mother pushes her small son in a swing,giving only a light force each time he returns,eventually he will be swinging quite high.The child can do this for himself by using his legs to increase the motion,but both the
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![英语阅读给个标准答案If a mother pushes her small son in a swing,giving only a light force each time he returns,eventually he will be swinging quite high.The child can do this for himself by using his legs to increase the motion,but both the](/uploads/image/z/15255739-19-9.jpg?t=%E8%8B%B1%E8%AF%AD%E9%98%85%E8%AF%BB%E7%BB%99%E4%B8%AA%E6%A0%87%E5%87%86%E7%AD%94%E6%A1%88If+a+mother+pushes+her+small+son+in+a+swing%2Cgiving+only+a+light+force+each+time+he+returns%2Ceventually+he+will+be+swinging+quite+high.The+child+can+do+this+for+himself+by+using+his+legs+to+increase+the+motion%2Cbut+both+the)
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