引导网格结构
Bootstrap中的网格结构如下所示：
示例
<div class = "box">
<div class = "row">
<div class = "col-*-*"></div>
<div class = "col-*-*"></div>
<div class = "col-*-*"></div>
<div class = "col-*-*"></div>
</div>
<div class = "row">...</div>
</div>
<div class = "box">
....
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