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                            為了使用內置的柵格系統將內容再次嵌套，可以通過添加一個新的 `.row` 元素和一系列 `.col-sm-*` 元素到已經存在的 `.col-sm-*` 元素內。被嵌套的行（row）所包含的列（column）的個數不能超過12（其實，沒有要求你必須占滿12列）。

![](https://img.kancloud.cn/9f/2f/9f2f099c1a755192ffdfdaa3dc54de74_884x154.png)

~~~html
<div class="row">
  <div class="col-sm-9">
    Level 1: .col-sm-9
    <div class="row">
      <div class="col-xs-8 col-sm-6">
        Level 2: .col-xs-8 .col-sm-6
      </div>
      <div class="col-xs-4 col-sm-6">
        Level 2: .col-xs-4 .col-sm-6
      </div>
    </div>
  </div>
</div>
~~~
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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