vortex time

例句：

1. 1.The vortex time is when the wind starts to pick up.
   涡旋时间是风开始变强的时候。
2. 2. The swirling water created a vortex that pulled us under.
   旋转的水形成了一个涡流，把我们吸了下去。
3. 3. The rotational time of the planets is calculated by measuring their distance from the sun.
   行星的旋转时间是通过测量它们离太阳的距离来计算的。