phonocardiograph amplifier

例句：

1. 1. Thephonocardiograph was usedto monitor the patient's heart rateand rhythm.
   声学心电图仪被用来监测患者的心率和节律。
2. 2. The phonocardiograph helped doctors diagnose heartconditions more accurately.
   声学心电图仪帮助医生更准确地诊断心脏病。
3. 3. During thestudy, the phonocardiograph recorded thepatient's heartbeats inreal-time.
   在研究中，声学心电图仪实时记录了患者的心跳。