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| 肺泡 (saccus aereus) | |||
| 气囊; 气泡 | |||
| 气袋 | |||
| air sac: 6 phrases in 4 subjects |
| Animal husbandry | 2 |
| Biology | 1 |
| Entomology | 2 |
| Veterinary medicine | 1 |
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