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| 补偿空间在矿块中开凿的用于容纳被爆破矿石破碎胀出的体积的空间 | |||
| 补偿空间 | |||
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compensation space : 5 phrases in 3 subjects |
| Air defense | 1 |
| Space | 3 |
| Technology | 1 |
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