relative eddy

例句：

1. 1. The relative eddy in the river is causing a lot of problems for the fish.
   河中的相对涡旋给鱼类带来了很多问题。
2. 2.The scientist found that the relative eddy was responsible for the sudden drop in temperature.
   科学家发现，相对涡旋是导致温度突然下降的原因。
3. 3. In this experiment, we observed the formation and movement of the relative eddy.
   在这个实验中，我们观察了相对涡旋的形成和移动。