tympanometer

例句：

1. 1. Doctors use tympanometers to check the patient's hearing.
   医生使用听诊器来检查患者的听力。
2. 2. The tympanometer is a medical instrument used to measure the pressure inside the ear.
   听诊器是一种用于测量耳内压力的医疗仪器。
3. 3. During the exam, the teacher uses a tympanometer to listen to the student's heartbeat.
   在考试期间，老师使用听诊器来听取学生的心跳。