Actionscript 3 Can'；不要停止齿轮转动

我是AS3编程的新手。我想问一下如何停止这个齿轮动画。我只是做了一个函数来停止旋转，但事件不会停止

import flash.events.MouseEvent;

var smallGearSpeed:Number = -2;
var bigGearSpeed:Number = 1;

btn_Normal.addEventListener(MouseEvent.CLICK, fl_rotateNormalHandler);
btn_Acc.addEventListener(MouseEvent.CLICK, fl_rotateAccHandler);
btn_Stop.addEventListener(MouseEvent.CLICK, fl_rotateStopHandler);

function fl_rotateStopHandler (evt:MouseEvent):void {
        addEventListener(Event.ENTER_FRAME, fl_rotateStop);
    }

function fl_rotateNormalHandler (evt:MouseEvent):void {
        addEventListener(Event.ENTER_FRAME, fl_rotateNormal);
    }

function fl_rotateAccHandler(evt:MouseEvent):void {
        addEventListener(Event.ENTER_FRAME, fl_rotateAcc);
    }


function fl_rotateNormal (evt:Event):void {
        rotateNormal();

    }

function fl_rotateAcc (evt:Event):void {
        rotateAcc();

    }

function fl_rotateStop (evt:Event):void {
        rotateStop();

    }

function rotateNormal():void {
        mc_BigGear.rotation += bigGearSpeed;
        mc_SmallGear.rotation += smallGearSpeed;

        trace("Normal Clicked !!!");

    }

function rotateAcc():void {
        mc_BigGear.rotation += bigGearSpeed;
        bigGearSpeed = bigGearSpeed + .1;

        mc_SmallGear.rotation += smallGearSpeed;
        smallGearSpeed = smallGearSpeed - .1;

        trace("Accelerate Clicked !!!");

    }

function rotateStop():void {
        mc_BigGear.rotation = bigGearSpeed - 1;
        mc_SmallGear.rotation = smallGearSpeed + 2;

        trace("Stop Clicked !!!");

    }

我希望有人能帮我解决这个问题。对不起，我的英语不好，谢谢：）

要“停止”活动，请删除您先前添加的侦听器，如：

removeEventListener(Event.ENTER_FRAME, fl_rotateNormal);

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非常感谢你解决了我的问题，它成功了！！：）