Word: 海上 (hǎishàng)

他在海上旅行。

Tā zài hǎishàng lǚxíng.

He travels across the sea.

海上的天气千变万化。

Hǎishàng de tiānqì qiānbiànwànhuà.

The weather at sea is constantly changing.

海上的轮船越来越远了。

Hǎishàng de lúnchuán yuèláiyuè yuǎnle.

The steamship on the sea is getting farther and farther away.

海上风很狂，船不能出去。

Hǎishàng fēng hěn kuáng, chuán bùnéng chūqù.

The wind at sea is violent, so the boats can't go out.

海军在海上进行了一次演习。

Hǎijūn zài hǎishàng jìnxíngle yícì yǎnxí.

The navy carried out an exercise at sea.

船在浩瀚的大海上前进。

Chuán zài hàohàn de dà hǎishàng qiánjìn.

The ship sailed on across the vast ocean.

这片海上有几个无人居住的岛屿。

Zhè piàn hǎishàng yǒu jǐ ge wúrén jūzhù de dǎoyǔ.

There are several uninhabited islands in this stretch of sea.

这艘船在海上航行了三天。

Zhè sōu chuán zài hǎishàng hángxíng le sāntiān.

This ship has been sailing at sea for three days.