at sea，on the sea，seaborne ；

[例句] 把她的人生比作一次海上航行不足以说明她丰富的经历。 The comparison of her life to a sea voyage simplifies her experience.

[例句] 一艘捕鱼船和一艘货船在波涛汹涌的海上相撞了。 A fishing vessel and a cargo ship collided in rough seas.

asea，on the sea ；

[例句] 绿色和平组织设法聚集起足够数量的小船在海上拦截该船。 Greenpeace managed to assemble enough boats to waylay the ship at sea.

[例句] 1,654名乘客在海上转搭了一艘挪威游轮。 1,654 passengers were transferred at sea to a Norwegian cruise ship.

maritime，nautical，[经] marine ；

[例句] 随后的报道称，海上的石油大火已经熄灭。 A later report said the oil fire on the sea was out.

[例句] 这幅画描绘的是海上的暴风雨. The painting is a representation of a storm at sea.

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[例句] 从海上吹来的和风令我非常惬意. I feel very comfortable in the zephyr from the sea.

[例句] 他怕的是敌人有组织地从海上大举进攻. His fear was powerful organized invasion from the sea.

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