浮动蓄电池

例句：

1. 1.The boat was floating on the calm sea.
   船在平静的海面上漂浮。
2. 2. The balloon floated above the clouds.
   气球飘浮在云层之上。
3. 3. The fish floated to the surface of the water.
   鱼浮到水面上。