织梦如何用dede:type调用指定一个栏目的描述

{dede:type typeid='12'}
       <div>
        <a href="[field:typelink/]"><img src="[field:typeimg /]" alt="" /></a>
       </div>
       <div class="pcknr">
        <h3>[field:typename /]</h3>
        <div class="pckwz">
         <p>[field:description/]</p>
        </div>
       </div>
 {/dede:type}