circulation frequency of the word classification

例句：

1. 1. The blood circulation isessential for the body's health.
   血液循环对于身体健康至关重要。
2. 2. The company's stockprice has been on a steady upward trendrecently.
   该公司的股票价格最近一直在稳步上升。
3. 3.The water circulation in the ocean is crucialfor the ecosystem.
   海洋中的水循环对生态系统至关重要。