你为自己的单反购买的第一个镜头是什么镜头？

What was the first lens you bought for your DSLR?

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他告诉我的那时候我刚买了第一个70- 200 mm的变焦镜头。

He told me this just after I bought my first 70-200mm lens.

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第一点就是被一些专业人士所熟知的“裁切系数”(crop factor，也称镜头焦距转换率)。

The first is what is known as the 'crop factor'.

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比如第一场第二次镜头。

And then say scene one take two.

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镜头切换检测是视频结构化的第一步。

Shot boundary detection is the first step in video structure.

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这里所展示的是虚拟世界客户会员公寓的第一个屏幕镜头。

Here are the first screen shots of the virtual world Guest apartment.

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镜头探测是视频内容结构化分析的第一步，也是非常关键的一步。

Shot detection is the first step in video content structured analysis.

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镜头探测是视频内容结构化分析的第一步，也是非常关键的一步。

Shot detection is the first step in video content structured analysis.

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