The flashcard defines 'optical' as an adjective meaning 'relating to the eyes' or 'visual'.
optical 是一个形容词，意思是“眼的”、“视觉的”或“光学的”。
| Front | optical [optic;-al a.] |
|---|---|
| Back | a.眼的； 视觉的； 光学的 |
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