C#交错数组

理论C#的交错数组为什么要倒着定义？
code：

        private double[][][] CoordReconstruct(double[] arr )
        {
            double[] subSubArr=new double[2];
            double[][] subArr=new double[yAxis+1][];
            for (int i = 0; i < yAxis + 1;i++ )
            {
                subArr[i] = subSubArr;
            }
            double[][][] newArr=new double[xAxis+1][][];
            for (int i = 0; i < xAxis + 1; i++)
            {
                newArr[i] = subArr;
            }
            int index = 0;

            for (int j = 0; j < yAxis; j++)
            {
                for (int i = 0; i < xAxis; i++)
                {
                    for (int fla = 0; fla < 2; )
                    {
                        newArr[i][j][fla] = arr[index];
                       
                        index++;
                        fla++;
                    }
                }
            }
            return newArr;
        }