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| # | 英语 | 汉语 | |
|---|---|---|---|
| 21 | operation room | 1 | |
| 22 | operon | 1 | |
| 23 | ophthalmology | 1 | |
| 24 | opiate | 1 | |
| 25 | opium | 1 | |
| 26 | oppress | 1 | |
| 27 | optic disc | 1 | |
| 28 | optical | 1 | |
| 29 | optics | 1 | |
| 30 | optimal | 1 | |
| 31 | optimum | 1 | |
| 32 | optometrist | 1 | |
| 33 | oral hygiene | 1 | |
| 34 | orbit | 1 | |
| 35 | organ | 1 | |
| 36 | organelle | 1 | |
| 37 | organic | 1 | |
| 38 | organism | 1 | |
| 39 | orifice | 1 | |
| 40 | orthopedics | 1 |