With the otoscope, the doctor can see your eardrum, the thin membrane between your outer and middle ear.
通过耳镜，医生可以看见骨膜，骨膜是中耳和外耳的分隔。
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The outer ear includes the ear lobe and external auditory canal, which funnels sound waves toward the eardrum (or tympanic membrane) allowing it to vibrate.
外耳包括耳垂和外耳道——用于把声波引入鼓膜，使之振动鼓膜。
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It is then able to avoid penetrating the membrane, so avoiding drilling and other debris dropping into the ear.