finecms同时调用子栏目和子栏目的文章怎么操作

　　　　　　　　　　{list action=category pid=0 id=31}   
                    {if $t.child}    
                        {list action=category pid=$t.id return=t2}  
                            <div class="depart_ulist left_fl">
                                <h3><a  target="_blank" href="{$t2.url}" >{$t2.name}</a></h3>
                                <ul>
                                {list action=module catid=$t2.id num=6 return=t3}
                                    <li><a  target="_blank" href="{$t3.url}">{$t3.title}</a><span>{dr_date($t3._updatetime, 'Y-m-d')}</span></li>
                                {/list}
                                </ul>
                            </div>
                         {/list}   
                    {/if}
                {/list}