spir 合并单元格

                TableRow row = table2.AddRow();
                var cell = row.AddCell();
                var par = cell.AddParagraph();
                par.Text = "测试的";
                cell.Paragraphs.Add(par);
                row.Cells.Add(cell);
                table2.Rows.Insert(0, row);
                table2.AddRow(false, 4);
                table2.ApplyHorizontalMerge(0, 0, 4);