Bootstrap 5提供了一种使用g-*类添加cols间隙的更舒适的方法

<div class="container">
  <div class="row g-2">
    <div class="col-6">...</div>
    <div class="col-6">...</div>
  </div>
</div>

文档:https://getbootstrap.com/docs/5.0/layout/gutters/

你可以使用colx -xs-*类来实现列与列之间的间隔，在下面编码的colx -xs-* div中。间距是一致的，这样所有的列都能正确对齐。为了获得均匀的间距和列大小，我将执行以下操作:

<div class="container">
    <div class="col-md-3 ">
        <div class="col-md-12 well">
            Some Content..
        </div>
    </div>
    <div class="col-md-3 ">
        <div class="col-md-12 well">
            Some Second Content..
        </div>
    </div>
    <div class="col-md-3 ">
        <div class="col-md-12 well">
            Some Second Content..
        </div>
    </div>
    <div class="col-md-3 ">
        <div class="col-md-12 well">
            Some Second Content..
        </div>
    </div>
    <div class="col-md-3 ">
        <div class="col-md-12 well">
            Some Second Content..
        </div>
    </div>
    <div class="col-md-3 ">
        <div class="col-md-12 well">
            Some Second Content..
        </div>
    </div>
    <div class="col-md-3 ">
        <div class="col-md-12 well">
            Some Second Content..
        </div>
    </div>
    <div class="col-md-3 ">
        <div class="col-md-12 well">
            Some Second Content..
        </div>
    </div>
</div>

您可以使用此处文档中的col-md-offset-*类来实现列之间的间距。间距是一致的，这样所有的列都能正确对齐。为了获得均匀的间距和列大小，我将执行以下操作:

<div class="row">
  <div class="col-md-5"></div>
  <div class="col-md-5 col-md-offset-2"></div>
</div>

在Bootstrap 4中使用:offset-2或offset-md-2

这也是一种方法。请查看以下网址https://jsfiddle.net/sarfarazk/ofgqm0sh/

<div class="container">
 <div class="row">
  <div class="col-md-6">
    <div class="bg-success">Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
    </div>
  </div>
  <div class="col-md-6">
    <div class="bg-warning">Sed ut perspiciatis unde omnis iste natus error sit voluptatem accusantium doloremque laudantium.
    </div>
  </div>
</div>
</div>

引导4 -使用嵌套行分离列。

<div class="container">
    <div class="row bg-info p-3">

        <!-- left column -->
        <div class="col-8 ">
            <div class="col-12 bg-light p-3">
                Lorem ipsum dolor sit amet consectetur adipisicing elit. Porro error enim, perferendis rerum, sit laudantium alias esse quas quae mollitia illum suscipit veritatis distinctio facere officia ullam repellendus accusamus odio!
            </div>
        </div>

        <!-- right column -->
        <div class="col-4 ">
            <div class="col-12 bg-light p-3">
                Lorem ipsum dolor sit amet consectetur adipisicing elit. Porro error enim, perferendis rerum, sit laudantium alias esse quas quae mollitia illum suscipit veritatis distinctio facere officia ullam repellendus accusamus odio!
            </div>
        </div>
    </div>
</div>

<div class="col-md-6">
    <div class="inner">
        <!-- Put the col-6 elements in the inner div -->
    </div>
</div>

默认情况下，这在外部div中提供了一些填充，这是您需要的方式。此外，您还可以使用自定义CSS修改填充。