在Bootstrap 5中，.media对象已被删除。相反，您可以使用沿着flexbox的实用程序类来创建类似的布局。

<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/bootstrap/5.1.0/css/bootstrap.min.css"/>

<div class="container mt-3">
<h2>Media Object</h2>
<p>Create a media object without .media and .media-body classes (BS5):</p>
<div class="d-flex border p-3">
    <img src="https://cdn.pixabay.com/photo/2016/11/18/23/38/child-1837375_960_720.png" alt="John Doe"
         class="flex-shrink-0 me-3 mt-3 rounded-circle" style="width:60px;height:60px;">
    <div>
        <h4>John Doe <small>Posted on February 19, 2016</small></h4>
        <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et
            dolore magna aliqua.</p>
    </div>
</div>
</div>

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Bootstrap 5的文档说明了如何使用卡来实现旧的媒体对象布局。https://getbootstrap.com/docs/5.0/components/card/#horizontal
举例来说：

<div class="card mb-3 border-0">
    <div class="row g-3">
        <div class="col-md-4">
            <svg class="bd-placeholder-img" width="100%" height="250" xmlns="http://www.w3.org/2000/svg" role="img" aria-label="Placeholder: Image" preserveAspectRatio="xMidYMid slice" focusable="false"><title>Placeholder</title><rect width="100%" height="100%" fill="#868e96"></rect><text x="50%" y="50%" fill="#dee2e6" dy=".3em">Image</text></svg> 
        </div>
        <div class="col-md-8">
            <div class="card-body p-0">
                <h5 class="card-title">Card title</h5>
                <p class="card-text">This is a wider card with supporting text below as a natural lead-in to additional content. This content is a little bit longer.</p>
                <p class="card-text"><small class="text-muted">Last updated 3 mins ago</small></p>
            </div>
        </div>
    </div>
</div>

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对于那些只使用Bootstrap的网格部分的人来说，你可以实现这样的媒体对象布局：

<figure class="row">
    <p class="col-auto">
      <img src="https://placeimg.com/100/100/animals" alt="A cute animal">
    </p>
    <figcaption class="col">Look at the cute animal</figcaption>
  </figure>

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col-auto将列收缩 Package 到内容的宽度（在上面的示例中，是图像），col只是占用（或分配，如果有多个）剩余的空间。有关更多信息，请参阅文档。