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- 問題詳情：LiRuyan,13yearsold,didsomethingspeciallastsummerwithhisclassmatesinShanghai.Theyworkedingroupswithtrafficpoliceatdifferentcrossroadsinthecity.Holdingsmallredflags,thestudentshelpedkeeporderandstoppedpeoplefromjaywalking(亂穿馬路).Asapartofthe...
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