机器先看的是结构。YouTube的内容长得都差不多：有标题、有简介、有标签，有时还有清晰的时间轴和章节。标题往往就是一个问题或主题，简介相当于摘要和补充说明，标签和分类是现成的语义标记，章节和时间点把一条长视频切成若干段。
“As soon as the device ends up in the hands of users, they do whatever they want with it”, says one of the former Meta employees.
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Buttons on the arms control volume, brightness, and the menu.
Мощный удар Израиля по Ирану попал на видео09:41