The eustachian tubes connect the middle ears to the pharynx, allowing air pressure on the eardrum to be equalized.

咽鼓管将中耳连接到咽上，可调节作用在鼓膜上的气压。

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The eustachian tubes connect the middle ears to the pharynx, allowing air pressure on the eardrum to be equalized.

咽鼓管将中耳连接到咽上，可调节作用在鼓膜上的气压。

youdao