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保护压力 : 12 phrases in 8 subjects |
| Automobiles | 2 |
| Electronics | 1 |
| Explosives and Explosive Ordnance Disposal | 1 |
| Metallurgy | 2 |
| Navigation | 1 |
| Oil / petroleum | 1 |
| Technology | 3 |
| Wind Energy | 1 |
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