第二个普遍原因是方便，其次是为了考验双方关系。

The second most popular reason is convenience, followed by testing the relationship.

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其次，第二个活动就是喜欢无休止的争论。

Second, there is endless bickering.

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其次，在第二章中简单介绍了视频分析的基本原理。

Secondly, in then second section, there simply introduce basic principles about video analysis.

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其次，在第二章中简单介绍了视频分析的基本原理。

Secondly, in then second section, there simply introduce basic principles about video analysis.

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