The Greek roots 'op' and 'opt' (from ops, optos) relate to 'eye' or 'sight'.
op, opt (GK ops, optos) 的意思是“眼睛”或“视力”。
| Front | op, opt (GK ops, optos)=eye, sight |
|---|---|
| Back | 眼睛，视力 |
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