介词短语
中文翻译：在海上
同义词：
['at the sea', 'by the sea', 'near the sea']
例句：
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1. Wedecided to go on the sea for a day trip.
我们决定去海边度一天假。
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2. The ship sailed on the sea and disappeared into the horizon.
那艘船驶向大海，消失在地平线上。
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3.They were fishing on the sea when it started to rain.
他们正在海里捕鱼，突然开始下雨了。