cardial

例句：

1. 1. The heart is the organ responsible for pumping blood throughout the body.
   心脏是负责将血液泵送到身体各个部位的器官。
2. 2. Cardiologists specialize in treating heart diseases.
   心脏病学家专门治疗心脏病。
3. 3. During exercise, our heart rate increases to match the increased demand for oxygen.
   运动时，我们的心率增加以满足对氧气需求的增加。