circulation supply system

例句：

1. 1. The blood flows through the body in a constant circulatory process.
   血液在身体中以持续的循环过程流动。
2. 2. Circulation is essential for the proper functioning of the heart and lungs.
   血液循环对于心脏和肺的正常功能至关重要。
3. 3. The company's stock price has been on a steady upward trend since its public offering.
   自公司公开上市以来，其股价一直呈上升趋势。