floating normalize control

例句：

1. 1.The boat was drifting slowly in the calm sea.
   这艘船在平静的海面上缓缓漂移。
2. 2. The balloon floated above the clouds.
   气球飘浮在云层之上。
3. 3.The fish was floating on the surface of the water.
   鱼在水面上漂浮着。