flow rule

例句：

1. 1.The flow rule is a fundamental principle of fluid dynamics.
   流动规则是流体动力学的一个基本原理。
2. 2. The flow rule is used to predict the behavior of fluids in various applications.
   流动规则用于预测流体在各种应用中的行为。
3. 3. The flow rule was developed by scientists to explain the movement of water in rivers andstreams.
   流动规则是由科学家开发出来的，用来解释河流和溪流中水的流动。