中耳炎a condition in which the middle ear (= the central part of the ear, behind the eardrum, through which sound travels) becomes swollen and painful
Some children are prone to middle ear infections, or otitis media. 一些儿童容易中间耳道发炎感染，也就是中耳炎。
Otitis media is caused by the build-up of fluid and air in the eustachian tubes. 中耳炎是由于咽鼓管内积聚液体和空气引起的。