为什么我写的section循环运行不显示呢

 $articlelist = array(
  array(
   "title" => "第一篇文章",
   "author" => "小王",
   "content" => "又写了一篇不知所云的文章"
  ),
  
  array(
   "title" => "第二篇文章",
   "author" => "小李",
   "content" => "又写了一篇不知所云的文章"
  )
 );
 $smarty->assign("articlelist",$articleList);

{section name=article loop=$articlelist}
  {$articlelist[article].title}
  {$articlelist[article].author}
  {$articlelist[article].content}
<br/>
{/section}