smarty 循环多行多列

<table width="90%" border="0" align="center" cellpadding="0" cellspacing="0" >
{section name=list loop=$ac }
{if $smarty.section.list.first || $smarty.section.list.rownum%2==1}
<tr bgcolor={cycle values="#EAEAEA,#DADADA"} height="28">
{/if}    
<td >内容</td>
{if $smarty.section.list.last || $smarty.section.list.rownum%2==0} 
</tr>
{/if}
{/section} 
</table>