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。
This means that if you actually want to guarantee reliability and correctess of the entire system, you have to pierce the "abstraction veil" and look at the actual properties and behaviours of the components being used in it, not the abstractions they represent.
。旺商聊官方下载对此有专业解读
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