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- 问题详情：LiRuyan,13yearsold,didsomethingspeciallastsummerwithhisclassmatesinShanghai.Theyworkedingroupswithtrafficpoliceatdifferentcrossroadsinthecity.Holdingsmallredflags,thestudentshelpedkeeporderandstoppedpeoplefromjaywalking(乱穿马路).Asapartofthe...
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