otoscope

例句：

1. 1. Doctors use otoscopes to examine the ears.
   医生使用听诊器来检查耳朵。
2. 2. The nurse held the patient's head and used an otoscope to listen to the heartbeat.
   护士拿着病人的头部，使用听诊器来听心跳。
3. 3. During the examination, the doctor carefully placed the otoscope on the patient's ear canal.
   在检查过程中，医生小心地把听诊器放在病人耳道上。