心脏学

例句：

1. 1.Cardiovascular diseases are the leading cause of death worldwide.
   心血管疾病是全球死亡的主要原因。
2. 2. The heart is a crucial organ that regulates blood flow throughout the body.
   心脏是一个关键的器官，它调节着整个身体的血流。
3. 3. Heart disease is often caused by high blood pressure and lack of exercise.
   心脏病通常由高血压和缺乏运动引起。