floating decimal subroutine

例句：

1. 1.The boat is floating on the calm sea.
   船在平静的海面上漂浮。
2. 2. The fish are drifting with the current.
   鱼随着水流漂移。
3. 3. The waves undulated gently against the shore.
   波浪轻轻拍打着岸边。