port circulating pump

例句：

1. 1.The port circulating pump is essential for maintaining the water quality in the port area.
   港口循环泵对于保持港口区域的水质至关重要。
2. 2.The port circulating pump helps to keep the water moving and prevent stagnation.
   港口循环泵有助于保持水的流动，防止停滞不前。
3. 3. The port circulating pump is used to distribute freshwater from the sea to the land.
   港口循环泵用于将海水中的淡水输送到陆地上。