You have a middle ear infection when germs get into the middle ear and the area fills up with fluid (or pus), which contains germ-fighting cells.
当微生物进入中耳引起感染，小气袋里就会因此充满脓液，这些脓液里包含了抗菌细胞。
The ear reacts by making pus, a thick liquid that fights bacteria. As the pus builds up it pushes on the eardrum, causing pain.
耳朵对此的反应就是化脓，既一种浓浓的抵抗细菌的液体，当脓水产生并推向耳膜，引起疼痛。
The ear reacts by making pus, a thick liquid that fights bacteria. As the pus builds up it pushes on the eardrum, causing pain.
耳朵对此的反应就是化脓，既一种浓浓的抵抗细菌的液体，当脓水产生并推向耳膜，引起疼痛。
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