涡形

例句：

1. 1. The vortex of the tornado is incredibly strong.
   龙卷风的涡流非常强大。
2. 2.The scientist observed the vortex andfound it to be a natural phenomenon.
   科学家观察了涡流并发现它是自然现象。
3. 3. The vortex caused the boatto spin around in circles.
   涡流使船在圆圈中旋转。