One generator covers all power demand when at sea.

在海上航行时一台发电机就能满足所有用电需求。

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When at sea, seamen could tell by the position of the star which direction they were going.

在海上，水手们能根据星星的位置来判断他们正往哪个方向而去。

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Others have been stranded at the sea when their scooters either failed or sank far from shore.

另一些人因为他们的水上摩托车失灵或在远离海岸的地方沉没而被困在海上。

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When sailors sighted a whale at sea, several whaleboats were lowered into the water from the much larger whaling ship.

VOA: special.2011.06.29

Doctor Lind thought the sailors were getting sick because they failed to eat some kinds of foods when they were at sea for many months.

VOA: special.2009.04.21

September is the month when the sea ice extent is at its lowest.

VOA: special.2009.10.27

Chief Petty Officer Andy Horsburgh, whose job is utilising the submarine's sophisticated sonar, says that when at sea other submarines need to worry because "we'll find them before they find us".

BBC: HMS Astute recovers from shaky start

Mr Cook said a universal method was needed as coastguards used latitude and longitude when they rescued at sea, and people used postcodes and street names when they gave directions.

BBC: South West Coast Path gets 500th 'life-saving' sign

The young eels, called glass eels when they are at sea, are then carried by the Gulf Stream and reach river systems across Europe.

BBC: River ladders give eels a leg up