YouTube今天推出了一个新的功能，可以让视频发布者邀请他人给他们上传的视频添加注释。
YouTube today introduced a new feature that allows publishers to invite others to annotate their videos.
传统搜索引擎依靠所谓的“元数据”进行搜索。这些元数据就是视频发布者在上传之前为视频添加的标签和关键词。
Traditional search engines depend on video publishers to add tags and keywords — called metadata — to the clips before they are uploaded to the Web.
就在几个星期前，YouTube曾推出过一个新的注释添加功能，可以让视频发布者更容易地在自己的视频中添加对话气泡或聚光灯。
Just a few weeks ago, YouTube introduced a new annotation feature that made it easier for publishers to add speech bubbles or spotlights to their videos.
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