smarty如何嵌套循环

{section name="sec1" loop=$typeList}
<TABLE class=left20 height=25 cellSpacing=0 cellPadding=0 width=624 
  background=images/indexbg.gif border=0>
   <TBODY>
   <TR>
    <TD class=zi align=left width=554 height=25>  <FONT 
     color=#ffffff><B>{$typeList[sec1].typeName}</B></FONT></TD>
    <TD vAlign=top width=70 height=25><a href="hot.html"><IMG src="images/more.gif" width="53" height="25" 
   border=0></a></TD>
   </TR></TBODY></TABLE>
  <table cellspacing="0" cellpadding="0">
   <tr> 
{section name="sec2" loop=$typeList[sec1].shop}
    <td><table cellspacing="0" cellpadding="0">
      <tr>
       <td valign="center" align="middle" width="116"><table cellspacing="0" cellpadding="0">
         <tr>
          <td><a href="show_prop.php?id={$typeList[sec1].shop[sec2].id}" target="_blank"><img src="http://localhost/{$typeList[sec1].shop[sec2].img_url}" width="84" height="88" border="0"></a></td>
         </tr>
       </table></td>
      </tr>
      <tr>
       <td class="hongzi" align="middle"> <a href="a01.htm">{$typeList[sec1].shop[sec2].name} </a> </td>
      </tr>
      <tr>
       <td class="zi2" align="middle">数量：{$typeList[sec1].shop[sec2].num} 个 </td>
      </tr>
      <tr>
       <td class="zi2" align="middle">价格：{$typeList[sec1].shop[sec2].price} 白金币 </td>
      </tr>
    </table></td>
{/section}
    </tr>
</table>
{/section}