Otoacoustic emissions(OAEs)are sounds that originate in the cochlea and propagate through the middle ear and into the external ear canal.
耳声发射是一种产生于耳蜗，经听骨链及鼓膜传导释放入外耳道的音频能量。
MethodsThe level of PGE2 in 12 middle ear cholesteatoma specimens(observed group) and 10 samples of normal external ear canal skin(control group) were examined by RIA method.
方法采用放射免疫法检测12份胆脂瘤上皮组织匀浆液（观察组）及10份正常外耳道皮肤组织匀浆液（对照组）中PGE2水平。
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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