semi-circumferential flow

例句：

1. 1. The water flowed through the narrow channel with a slow and steady pace.
   水流过狭窄的通道，缓慢而稳定地流动。
2. 2.The river's semi-circumferential flow is essential for the ecosystem.
   河流的半圆周流对于生态系统至关重要。
3. 3.The scientists studied the semi-circumferential flow of the ocean currents to understand their impact on the environment.
   科学家们研究了海洋洋流的半圆周流，以了解其对环境的影响。