问如何增加定时器AS3

EN

//Create new timer object
        tEggTimer = new Timer (nTimerSpeed);
        //Listen for timer intervals
        tEggTimer.addEventListener(TimerEvent.TIMER, addEggs, false, 0, true);
        //start timer
        tEggTimer.start();

private function addEggs(e:TimerEvent):void 
    {
        //var eggGlobalPosition:Point = _Egg.localToGlobal(new Point(_Bunny.x, _Bunny.y));

        _Egg = new mcEgg();
        stage.addChild(_Egg);
        _Egg.x = _Bunny.x;
        _Egg.y = _Bunny.y + 30;
        aEggArray.push(_Egg);
        trace(aEggArray.length);

    }

private function updateDifficulty():void 
    {
        if (difficultyUpdate) return;

        if (nScore >= 2)
        { 
            tEggTimer.removeEventListener(TimerEvent.TIMER, addEggs);
            tEggTimer.stop();
            tEggTimer = new Timer(200);
            tEggTimer.addEventListener(TimerEvent.TIMER, addEggs);
            tEggTimer.start();