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| 耐火石; 打火石 | |||
| 燧石; 耐火岩石; 耐火粘土 | |||
| 耐火岩石; 耐火硅质岩; 火石; 黄铁矿结核 | |||
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fire stone : 2 phrases in 2 subjects |
| Explosives and Explosive Ordnance Disposal | 1 |
| Technology | 1 |
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