海上

海上 means 'on the sea' or 'at sea,' referring to the surface of a body of water, typically the ocean. It is often used in nautical contexts or to describe activities that take place on the water.

The character 海 (hǎi) means 'sea' or 'ocean,' while 上 (shàng) means 'above,' 'on,' or 'up.' Together, they form a prepositional phrase indicating location on the sea.

海上 is commonly used in phrases like 海上旅行 (travel at sea) or 海上作业 (seafaring work). It also appears in idioms and expressions related to maritime life, such as 海上生明月 (the bright moon rises over the sea), which is a poetic reference to the moon rising over the ocean.