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| fulcrum; joint pin; knuckle pin | |||
| joint axes | |||
| 关节 轴: 33 phrases in 13 subjects |
| Air defense | 1 |
| Anatomy | 3 |
| Architecture | 1 |
| Artificial intelligence | 1 |
| Automobiles | 2 |
| Construction | 3 |
| General | 1 |
| Nursing | 1 |
| Oil / petroleum | 1 |
| Rail transport | 1 |
| Space | 2 |
| Sports | 3 |
| Technology | 13 |
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