冷水环流

例句：

1. 1. The cold circulatory system is responsible for maintaining body temperature.
   循环系统负责维持体温。
2. 2. The doctor recommended a new medication that improves circulation.
   医生推荐了一种新药，可以改善血液循环。
3. 3.During the winter months, the cold circulatory system becomes more active to help maintain body temperature.
   冬天，循环系统变得更加活跃，以帮助保持体温。