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齿环 : 71 phrases in 17 subjects |
| Agriculture | 4 |
| Air defense | 1 |
| Architecture | 1 |
| Automobiles | 2 |
| Biology | 1 |
| Bridge construction | 1 |
| Construction | 2 |
| Dentistry | 1 |
| Drilling | 2 |
| Figure skating | 1 |
| Latin | 2 |
| Mechanics | 1 |
| Metallurgy | 2 |
| Nautical | 1 |
| Space | 2 |
| Technology | 46 |
| Wind Energy | 1 |
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