您可以使用 flex 来提高响应能力，它会为您处理一切:

A column1 grade column2 column3

这是

和

解决方案

<div class="容器"><div class="row"><div class="col-md-1 both"><div class="row"><h1>A</h1>

You can do flex for responsiveness it will take care of things for you:

<div class="row"><span>等级</span>

here is the fiddle

<div class="col-md-11"><div class="row"><div class="col-md-4 col-sm-6 col-xs-12"><h3>第1列</h3><p>Lorem ipsum dolor sat amet, consectetur adipisicing 精英...</p><p>Ut enim ad minim veniam, quis nostrud exeritation ullamco Laboris...</p>

and

<div class="col-md-4 col-sm-6 col-xs-12"><h3>第2列</h3><p>Lorem ipsum dolor sat amet, consectetur adipisicing 精英...</p><p>Ut enim ad minim veniam, quis nostrud exeritation ullamco Laboris...</p>

<div class="col-md-4 col-md-offset-0 col-sm-6 col-sm-offset-6 col-xs-12"><h3>第3列</h3><p>Lorem ipsum dolor sat amet, consectetur adipisicing 精英...</p><p>Ut enim ad minim veniam, quis nostrud exeritation ullamco Laboris...</p>