The boat rocked up and down in rhythm with the sea.

小船随着海浪起伏有致。

《牛津词典》

The boat bobbed up and down on the water.

小船在水面颠簸。

《牛津词典》

The waves were about five feet high now, and the bow of the boat was leaping up and down.

浪头现在约有五英尺高，船头上下颠簸。

《柯林斯英汉双解大词典》

As the boat moved slowly up the East River in New York, the doctors put President Cleveland to sleep with an anesthetic drug.

VOA: special.2010.06.17

It's on the water, in the boat and you，and it takes up a lot of time.

在水上，在船上，很花时间。

赛艇项目很流行 - SpeakingMax英语口语达人

The elephants look up and watch as your boat turns away and you head back to camp at the end of another day on safari in Africa.

VOA: special.2009.08.19

Every now and then, one breaks at our stern, ramping up the boat and surging us forward.

BBC: Sailing in Croatia

You have to pick up your boat and carry it around the dam.

CNN: Snake River dam resolution called unfair

The closest point to the island is a caravan site and a cove where you can tie up a boat.

BBC: Norway attacks: The agony of the rescue