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пресноводная экосистема stresses
construct.	freshwater ecosystem
environ.	freshwater ecosystem (The living organisms and nonliving materials of an inland aquatic environment; Живые и неживые организмы внутренней водной среды обитания)
mil.	freshwater system
nucl.phys., ecol.	fresh water ecosystem
пресноводные экосистемы
Makarov.	freshwater ecosystems