counterflow

例句：

1. 1. The river has a counterflow that carries sediment downstream.
   这条河有一个逆流，将沉积物带到下游。
2. 2.The scientist noticed that the counterflow of gases in the chamber was affecting the temperature.
   科学家注意到，腔体内气体的逆流正在影响温度。
3. 3. In this experiment, we observed a counterflow of water from one container to another.
   在这个实验中，我们观察到水从一容器流向另一容器的逆流。