cardiac electrophysiology

例句：

1. 1. The heart isthe primary organ responsible for circulatingblood throughout the body.
   心脏是负责将血液输送到全身的主要器官。
2. 2. Cardiologists specialize in the diagnosis and treatment ofheart diseases.
   心脏病学家专门从事心脏病的诊断和治疗。
3. 3. During exercise, the heartrate increases to support the increased demand foroxygen.
   在运动时，心率增加以支持对氧气需求的增加。