耳の

of the ear

→ 耳
phrase Rare #30,647
of the ear の connects 耳 (ear) to the noun that follows it.
JA: 耳の後ろが痛いです。
EN: The area behind my ear hurts.

耳の感染症によくかかります。

I often get ear infections.

耳の検査を受けた。

I had a hearing test.

彼の耳の病気は音を聞くことをとても困難にした。

His ear condition made it very difficult for him to hear.