sea是可数名词。表示非特指单数时前面可加a ,表示复数时后面可加 s。
sea：n.海；海洋；海面情况；海浪状况；
复数： seas
After ten days at sea， we had our first sight of land。
我们在海上航行十天之后，首次看见陆地。
The sea wall was not proof against the strength of the waves。
防波堤挡不住海浪的力量。
The smell of the sea carried her back to her childhood。
大海的气息勾起了她童年的回忆。
The smell of the sea took him back to his childhood。
大海的气味使他回想起孩提时代。
温馨提示：
