未声明的有关问题

未声明的问题
初学delphi问个问题，这是我写的程序
unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls;

type
  TForm1 = class(TForm)
  Label1: TLabel;
  Button1: TButton;
  Button2: TButton;
  procedure Button1Click(Sender: TObject);
  procedure Button2Click(Sender: TObject);
  private
  { Private declarations }
  public
  { Public declarations }
  end;

var
  Form1: TForm1;
implementation

{$R *.dfm}

procedure TForm1.Button1Click(Sender: TObject);
begin
 Lable1.Caption:='这是我第一个delphi程序';
end;

procedure TForm1.Button2Click(Sender: TObject);
begin
 close;
end;

end.
运行结果是：unit1.pas(30):undeclared identifier:'lable1'
  project1.dpr(5): could not compile used unit 'Unit1.pas'
怎么改呀。。未声明lable1么？

[解决办法]
lable1 昏迷啊 明明是label1你写错字了
[解决办法]
hello world