The ship was rolling in the rough sea.

船在汹涌的大海中颠簸着。

youdao

The ship was rolling and pitching heavily in the rough sea.

船舶在狂涛中簸荡。

《新英汉大辞典》

The ship tossed wildly in the rough sea.

船在汹涌的大海中颠簸着。

youdao

But the sea was so rough that the small boats could not be used.

VOA: special.2009.08.13

When we couldn't escape from a rough sea, we would take refuge in a cave and pass the night shivering.

BBC: Like the Amalfi coast? Try the Gargano promontory

Even with the assistance of the floats, the rough sea can make it a trying trip for those with no sea legs.

BBC: The Philippines�� secret sanctuary

Melnyk and I find an open slot among the crowd of surfcasters on the beach and duckwalk backwards into the rough sea.

FORBES: Magazine Article