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| annulus tracheae; rings tracheal | |||
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气 管 环 : 54 phrases in 13 subjects |
| Anatomy | 1 |
| Automobiles | 1 |
| Earth sciences | 4 |
| Ecology | 1 |
| Electronics | 1 |
| Metallurgy | 15 |
| Oil / petroleum | 2 |
| Otorhinolaryngology | 9 |
| Refrigeration | 2 |
| Space | 1 |
| Surgery | 1 |
| Technology | 15 |
| United States | 1 |
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