Dizionario Polacco - Inglese
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zbiornik retencyjny in inglese:
1. 
reservoir
Water is piped from the reservoir to the city.
A spill from a reservoir containing highly toxic red sludge cost the lives of at least three people
It sits on top of an enormous hot spot, a reservoir of molten rock that begins at least 2,000 km down in the Earth and rises to near the surface.
storage reservoir 
retention basin 