其实，把视频里的音轨用语音识别转化成文字索引并时间编码的技术已经有了。

The technology for converting the audio tracks of video via speech recognition to plain text indexed to time-code has been around for a while.

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什么时候使用语义搜索引擎呢？

When to use semantic search engines

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最后作者提出在词汇学习和教学中使用语料索引的范例。

Samples of using concordancing in vocabulary learning and teaching are proposed in the last section of this part.

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