heart rate monitor

例句：

1. 1. He useda heart rate monitor to track his workout progress.
   他使用心率监测器来追踪他的锻炼进度。
2. 2. The doctor recommended the patient to use a heart rate monitor during recovery.
   医生建议病人在康复期间使用心率监测器。
3. 3. She was worried about her husband's high heart rate while he was exercising.
   她担心丈夫在锻炼时心率过高。