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安全挡 : 16 phrases in 10 subjects |
| Agriculture | 1 |
| Automobiles | 1 |
| Boxing | 3 |
| Bridge construction | 1 |
| Electronics | 1 |
| Metallurgy | 1 |
| Oil / petroleum | 1 |
| Rail transport | 2 |
| Space | 1 |
| Technology | 4 |
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