耳朵感染是怎样引起的？中耳和咽喉之间的通道叫耳咽管。
Between your middle ear and your throat there is a passage called the eustachian (say: yoo - stay -she-un) tube.
对于大一些的孩子，虽然耳咽管会更长一些，可以更好的发挥作用，但是还是会出现问题。
The eustachian tubes get longer and usually work better in older kids, but they can still cause problems.
当孩子小的时候，尤其是三岁以下的儿童，耳咽管非常短，不能有效地将微生物阻隔在外面。
When you were young, especially before you turned 3, the eustachian tubes were very small and less able to keep germs out.
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