Basis cordis

例句：

1. 1.The patient's heart rate was stable at a basal level.
   患者的心率在基线水平稳定。
2. 2.The doctor monitored the patient's heart rate during the procedure.
   医生在手术过程中监测了患者的心率。
3. 3. The study found that basal heart rate is an important indicator of health.
   研究发现基础心率是健康的重要指标。