帮我看看这些代码是什么意思？

Question

try
                  {
                        text1 = text1.Replace(a("\u0423", num3), (string) null).Replace(a("\u2923", num3), (string) null).Replace(a("\u2e23", num3), (string) null);
                        b b1 = (b) this.d.SelectedItem;
                        if ((text1.Substring(0, 1) == b1.c()) || (text1.Substring(0, 1) == b1.f()))
                        {
                              int num1 = text1[0x18] - '0';
                              int num2 = a.a(text1.Substring(0, 0x18));
                              if (num1 == num2)
                              {
                                    flag1 = true;
                                    string text2 = b1.b();
                                    string text3 = text2 + a("\u0a23\u6a25\u6127\u6929", num3);
                                    StreamWriter writer1 = new StreamWriter(text3, false, Encoding.Default);
                                    writer1.WriteLine(a("\u1823\u1925\u5027\u4729\u402b\u0e2d\u462f\u5731\u4633\u4535\u5137\u5539\u523b\u033d\u623f\u7341\u6a43\u7645\u6a47\u7549\u724b", num3));
                                    writer1.WriteLine(a("\u1823\u4a25\u4927\u5929\u5f2b\u4f2d\u5c2f\u5e31\u5133\u0835", num3));
                                    string[] textArray1 = new string[] { a("\u2d23\u1a25\u4b27\u4529\u412b\u5e2d\u5f2f\u5c31\u5133\u5835\u4c37\u1a39\u523b\u5f3d\u2d3f\u2741\u7943\u6445", num3), text2, a("\u0623\u0625\u4427\u4329\u4f2b\u4b2d\u5e2f\u4131\u5133\u0b35\u1a37", num3), text1, a("\u0623\u0925\u1627", num3) } ;
                                    writer1.WriteLine(string.Concat(textArray1));
                                    writer1.WriteLine(a("\u1823\u0925\u4427\u4b29\u5f2b\u5d2d\u512f\u5e31\u5833\u5335\u0637", num3));
                                    writer1.Close();
                                    this.l.ForeColor = Color.Blue;
                                    this.l.Text = a("\u7023\u4e25\u4d27\u0a29\u402b\u472d\u532f\u5731\u5a33\u4535\u5d37\u1a39\u5a3b\u573d\u2c3f\u2741\u6443\u6145", num3) + text3 + a("\u0423\u4e25\u4927\u5929\u0c2b\u4c2d\u552f\u5731\u5a33\u1635\u5b37\u4839\u593b\u5f3d\u343f\u2741\u2043\u6845", num3);
                                    base.DialogResult = DialogResult.OK;
                              }
                        }
                        return;
                  }
                  finally
                  {
                        if (!flag1)
                        {
                              this.l.ForeColor = Color.Crimson;
                              this.l.Text = a("\u6823\u4f25\u4b27\u4f29\u422b\u5d2d\u552f\u1231\u5233\u5f35\u5437\u5f39\u1c3b\u503d\u2f3f\u3641\u6443\u2545\u3a47\u2f49\u2d4b\u3a4d\u354f\u3651\u7553", num3);
                              MessageBox.Show(a("\u7023\u4e25\u4d27\u0a29\u402b\u472d\u532f\u5731\u5a33\u4535\u5d37\u1a39\u573b\u5b3d\u393f\u6241\u2d43\u3545\u6847\u2449\u234b\u3a4d\u704f\u2451\u3553\u3a55\u3157\u3e59\u725b", num3), this.Text, MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
                        }
                  }