平均数是统计学中最常用的一种统计指标，一般分为算术平均数和加权平均数，它们有一定的区别。
I\'ve created CocosNode, then inserted sprite in this node. I moved node and sprite 开发者_C百科separately. As result node has some coordinate, sprite has another coordinate. I see sprite on the scree
加载中,请稍侯......