diately took part in the activity when Curly was down on the ground .Spitz also did that .
　　
　　It was a second first time that Buck had seen dogs fight like wolves .At a short moment ,a life no longer existed .Buck learned another lesson ,that was life in the North was primitive ,cruel,and no fair play ,once you were down on the ground ,it was the end of you .Here ,only the strong could survive ,one must be very careful ,the others around you might be your enemy and your opponent .I think in Buck ‘ life ,this point always plays an important role .For example ,he always kept calm minds about Spitz .
　　
　　On the other hand ,from the Curly accident ,Buck got a clear thought about Spitz ,in Buck ‘s later life ,Spitz was important .First ,Spitz was the leader of the whole team ,Buck had to follow him and avoid unnecessary conflict when he himself was not strong ,at the beginning ,it was impossible for Buck to defeat Spitz .So ,here Buck did a very good job .Second ,Spitz was a