图片这个字段调用不出来，给看看，应该如何调用      

    {dr_get_file($t.tupian)}
{list action=linkage code=fenlei pid=$params.fenlei more=1}
                     <div class="item">
                <a href="{Router::search_url($params, 'classify', $t.id,'products')}">
                     <div class="imgBox"><img src=" {dr_get_file($t.tupian)}"></div>
                    <h1>{$t.name}</h1>
                </a>
            </div>
        {/list}