问Angular ng-repeat错误“不允许在中继器中复制？

<div class="idea item" ng-repeat="item in items" isoatom>    

    <div class="section comment clearfix" ng-repeat="comment in item.comments | range:1:2">

        ....

    </div>

</div>

myapp.filter('range', function() {

    return function(input, min, max) {

        min = parseInt(min); //Make string input int

        max = parseInt(max);

        for (var i=min; i<max; i++)

            input.push(i);

        return input;

    };

});