This post tests YouTube video embeds.
此帖测试嵌入 YouTube 视频。
Simply wrap embeds with a <div> element and the appropriate classes:
只需用<div>元素和适当的 类 对嵌入内容进行包装即可：
<!-- 16:9 aspect ratio 比例 -->
<div class="embed-responsive embed-responsive-16by9">
<iframe class="embed-responsive-item" src="..."></iframe>
</div>
<!-- 4:3 aspect ratio 比例 -->
<div class="embed-responsive embed-responsive-4by3">
<iframe class="embed-responsive-item" src="..."></iframe>
</div>
<!-- responsive iframe. The framesize reduces proportionately when viewing in mobile -->
<!-- 响应式 iframe。在移动设备上观看时，框架尺寸会按比例缩小 -->
<div class="video-container">
<iframe class="embed-responsive-item" src="..."></iframe>
</div>
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