Umkehr effect

例句：

1. 1. The company's decision to reverse the policy has sparked controversy.
   公司决定撤销政策引发了争议。
2. 2. The scientist observed that the inversion effect could be responsible for the phenomenon.
   科学家观察到逆流效应可能是导致该现象的原因。
3. 3. The umkehr effect is a fascinating concept in fluid dynamics.
   逆流效应是流体动力学中一个引人入胜的概念。