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The retina is a thin layer at the back of your eye. Light lands on it, and it sends a picture of what you see to your brain. If the retina is hurt, the picture can go dark, blur, or get holes in it. Doctors use this word a lot; in ordinary talk people often just say “the back of the eye,” unless they mean this exact part. It is a body-part word, like iris or lens. The old name pictured it as a net, because the blood vessels there look like one — though actually, in class you only need the body meaning, not the history.
視網膜
組成From Medieval Latin rētīna, short for tunica rētīna, “net-like layer,” for the net of blood vessels at the back of the eye.
原始詞典資料1 筆記錄
以下是外部詞典記錄的用法，原文照列，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
retinanoun/ˈɹɛt.ɪ.nə/
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medicineophthalmologysciencesThe thin layer of cells at the back of the eyeball that contains rods and cones sensitive to light, which trigger nerve impulses that pass via the optic nerve to the brain, where a visual image is formed.
資料來源：英文維基詞典 English Wiktionary（CC BY-SA 4.0）。 原文照列，未經改寫。