cyclom

例句：

1. 1. The heart's circulatory system is responsible for delivering oxygenated blood to the body's tissues.
   心脏的循环系统负责将富含氧气的血液输送到身体各组织。
2. 2. The brain has a complex circulatory system that helps distribute nutrients and remove waste products.
   大脑拥有一个复杂的循环系统，有助于营养物质的分配和废物的清除。
3. 3. The human body has a unique circulatory system that allows us to maintain a stable internal temperature.
   人体具有独特的循环系统，使我们能够维持稳定的内部温度。