Second, each embedded DHV should be very relevant to the story.

第二，嵌入的DHV必须跟故事有很直接的关系。

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Among them, DHV-1 is the most virulent, since the mortality rate can reach high up to 80% once ducklings infected within 3 weeks old.

三种鸭肝炎病毒以DHV - 1病原性最强，当3周龄以内之小鸭感染DHV - 1病毒时，其致死率高达80%以上。

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This paper develops a DSP - based Downhole Video (DHV) acquisition system and the approach to compress the data, which is suitable in high temperature conditions.

提出了一种基于DSP的井下电视(DHV)视频采集系统及数据压缩方法，适合较高温度下的工作环境。

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