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That statement is referring to how HBV makes it's DNA copies inside the host cell.

Since HBV is a DNA virus, it uses DNA-Dep-DNA polymerase. All this means is this:

1. HBV starts with a parental Genome that is dsDNA
2. It then forms an intermediate that is ssRNA
3. Lastly it ends up with a dsDNA progeny

So all that sentence is saying is that although there is a RNA intermediate, overall the HBV polyermase enzyme is DNA dep.

Hope that helped :).
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