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| clearance; air-gap | |||
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悬距 : 25 phrases in 8 subjects |
| Agriculture | 1 |
| Architecture | 1 |
| Automobiles | 3 |
| Economy | 1 |
| Electronics | 3 |
| Metallurgy | 4 |
| Sports | 1 |
| Technology | 11 |
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