我有一段delphi代码，请高手能给我详细的解释，谢谢(争取每句都能翻译成中文)

{创建窗体自动生成的代码}
unit Unit1;

interface

uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, DB, DBTables, Grids, DBGrids, StdCtrls, ExtCtrls;

type

{这一段是注册控件,窗口中的所有空间在这里列出}
TForm1 = class(TForm)
RadioGroup1: TRadioGroup;
RadioButton1: TRadioButton;
RadioButton2: TRadioButton;
RadioButton3: TRadioButton;
Button1: TButton;
Edit1: TEdit;
Label1: TLabel;
DBGrid1: TDBGrid;
DataSource1: TDataSource;
Table1: TTable;
Table1EmpNo: TIntegerField;
Table1LastName: TStringField;
Table1FirstName: TStringField;
Table1PhoneExt: TStringField;
Table1HireDate: TDateTimeField;
Table1Salary: TFloatField;
Edit2: TEdit;

{空间的事件注册}
procedure FormCreate(Sender: TObject);
procedure RadioButton1Click(Sender: TObject);
procedure RadioButton2Click(Sender: TObject);
procedure RadioButton3Click(Sender: TObject);
procedure Button1Click(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;

{定义全局变量}
var
Form1: TForm1;
Checked:array [1..3]of boolean;
MinNo,MaxNo:integer;

implementation

{$R *.dfm}

{这个是当窗体被打开，但是没有进行任何动作之前，窗体要进行的操作}
procedure TForm1.FormCreate(Sender: TObject);
begin
Edit2.Enabled:=False;//文本框2可见，但不可编辑
Table1.Open;//表控件
Table1.FindLast;//表中数据的最后一行
MaxNo:=Table1EmpNo.Value;//将最后一行的编号给变量MaxNo
Table1.FindFirst;//表中数据的第一行
MinNo:=Table1EmpNo.Value;//将第一行的编号给变量MinNo

end;

{RadioButton1控件的单击事件}
procedure TForm1.RadioButton1Click(Sender: TObject);
begin
RadioButton1.Checked:=True;//RadioButton1控件设为选中状态
Showmessage('编号的最大范围为'+inttostr(MinNo)+'~'+inttostr(MaxNo));//弹出窗口提示,范围是上面赋值的MinNo到MaxNo,IntToStr是字符串类型转换成整型
end;

{同RadioButton1Click}
procedure TForm1.RadioButton2Click(Sender: TObject);
begin
RadioButton2.Checked:=True;
Showmessage('编号的最大范围为'+inttostr(MinNo)+'~'+inttostr(MaxNo));
end;

{同RadioButton1Click}
procedure TForm1.RadioButton3Click(Sender: TObject);
begin
RadioButton3.Checked:=True;
Edit2.Enabled:=True;//文本框2设置为可编辑状态
Showmessage('编号的最大范围为'+inttostr(MinNo)+'~'+inttostr(MaxNo)+';请分别输入!');
end;

{button按钮控件单击事件}
procedure TForm1.Button1Click(Sender: TObject);
begin
if (not RadioButton1.Checked)and (not RadioButton2.Checked)and (not RadioButton3.Checked)then//判断如果RadioButton1,2,3同事没有被选中时
begin
showmessage('请选择查询方式!');//弹出窗口提示
Exit;//直接跳出，下面代码不再执行
end;
if RadioButton1.Checked then //如果RadioButton1被选中了
if Table1.FindKey([Edit1.Text]) then//如果选中状态下,文本框1中内容在表数据中找到了，提示记录找到，否则提示没找到
showmessage('您要查询的记录已找到!') else
showmessage('对不起,没有您要查询的记录!');
if RadioButton2.Checked then
begin
//同上，如果找到提示找到记录
Table1.FindNearest([Edit1.text]);
showmessage('已找到相关记录!');
end;
if RadioButton3.Checked then
begin
//如果RadioButton3被选中,在表中查找文本框1和文本框2的值之间的数据
Table1.SetRange([Edit1.Text],[Edit2.Text]);
Edit2.Enabled:=False;//文本框2不可编辑状态
end;
end;

end.

建议打开Delphi自己写一个，马上就明白了

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