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Thisisastreetcrossing.Thereareredandgreenlightsatea...
问题详情: Thisisastreetcrossing.Thereareredandgreenlightsateachcorner.Driversmustwatchthelightscarefully. Whenthereisagreenlight,thecarmaygoon.Whenthereisaredlight,thecarsmuststop.Theymus...