słownik polsko - angielski
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nagromadzić się po angielsku:
1. 
build up
Animals build up groups.
It took him nearly 20 years to build up such a big collection of clockwork trains.
But I think that we can learn from the others and further build up our system.!
Angielskie słowo "nagromadzić się" (build up) występuje w zestawach:
1 test, 8.11.18 r.2. 
Pile up
The reports will begin to pile up
My work's really starting to pile up.