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代码编辑器：

<!DOCTYPE htm>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<link href="https://cdn.bootcss.com/bootstrap/2.3.2/css/bootstrap.min.css" rel="stylesheet">
<style>body {margin:10px}</style>
<ul class="media-list">
   <li class="media">
      <a class="pull-left" href="#">
         <img width="80px" class="media-object" src="/static/i/css/paris.jpg" 
         alt="Generic placeholder image">
      </a>
      <div class="media-body">
         <h4 class="media-heading">Media heading</h4>
         <p>This is some sample text. This is some sample text. 
            This is some sample text. This is some sample text.
            This is some sample text. This is some sample text. 
            This is some sample text. This is some sample text.</p>
         
         <div class="media">
            <a class="pull-left" href="#">
               <img width="80px" class="media-object" src="/static/i/css/paris1.jpg"
               alt="Generic placeholder image">
            </a>
            <div class="media-body">
               <h4 class="media-heading">Nested media heading</h4>
               This is some sample text. This is some sample text. 
               This is some sample text. This is some sample text.
               This is some sample text. This is some sample text. 
               This is some sample text. This is some sample text.
               
               <div class="media">
                  <a class="pull-left" href="#">
                     <img width="80px" class="media-object" src="/static/i/css/paris2.jpg" 
                     alt="Generic placeholder image">
                  </a>
                  <div class="media-body">
                     <h4 class="media-heading">Nested media heading</h4>
                     This is some sample text. This is some sample text. 
                     This is some sample text. This is some sample text.
                     This is some sample text. This is some sample text. 
                     This is some sample text. This is some sample text.
                  </div>
               </div>
            </div>
         </div>
         
         <div class="media">
            <a class="pull-left" href="#">
               <img width="80px" class="media-object" src="/static/i/css/paris3.jpg" 
               alt="Generic placeholder image">
            </a>
            <div class="media-body">
               <h4 class="media-heading">Nested media heading</h4>
               This is some sample text. This is some sample text. 
               This is some sample text. This is some sample text.
               This is some sample text. This is some sample text. 
               This is some sample text. This is some sample text.
            </div>
         </div>
      </div>
   </li>
   <li class="media">
      <a class="pull-right" href="#">
         <img width="80px" class="media-object" src="/static/i/css/paris.jpg" 
         alt="Generic placeholder image">
      </a>
      <div class="media-body">
         <h4 class="media-heading">Media heading</h4>
         This is some sample text. This is some sample text. 
         This is some sample text. This is some sample text.
         This is some sample text. This is some sample text. 
         This is some sample text. This is some sample text.
      </div>
   </li>
</ul>

代码编辑器：

运行结果：