Geçen yıl, o, denizde üç ay geçirdi.
- Last year, he spent three months at sea.
Geçen yıl üç ay boyunca denizdeydi.
- Last year, he was at sea for three months.
Most of the class was at sea after the first week.
... pile up on the sea bottom over millions of years, ...
... WE GOTTA HAUL IT BACK TO SEA BEFORE IT DIES! ...