projections投影图projectionn.投影；投射；规划；发射；凸出物；预测；放映projection matrices投影矩阵projection receiver投影电视接收机projection operator射影算子projection viewport投影视口projection decision投影决策projection transfer投影转绘projection velocity抛射速度projection interval渐长区间projection function射影函数projection analysis投影分析