tubular stethoscope

例句：

1. 1.Doctors use a tubular stethoscope to listen to the patient's heartbeat.
   医生使用听诊器来听病人的心跳。
2. 2.The nurse carefully placed the tubular stethoscope on the patient's chest.
   护士小心翼翼地将听诊器放在病人的胸前。
3. 3.The doctor used the tubular stethoscope to diagnose the patient's condition.
   医生使用听诊器诊断病人的状况。