In fish, the gills are designed for water to flow through to extract oxygen from the water.
(the gills; are designed; to flow through to extract oxygen from the water; L:In fish) (the gills; to flow; through) (the gills; to extract; oxygen; from the water)
the gills the gills the gills
are designed to flow to extract
to flow through to extract oxygen from the water L:In fish
through
oxygen from the water