см. тж. 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.