. нередко встречаться; широко распространён•
Uridine is frequent among ...•
Basaltic volcanics are abundant (or frequently occur) in some areas.•
Such viruses are of frequent occurrence.•
Brown fat occurs extensively in species which hibernate.•
This phenomenon is common (place) (or widespread, or usual) along the English and French coasts.•
This problem is widely met (or encountered) in practice.