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| 台阶式挖土 | |||
| 台阶式工作面掘进 | |||
| 修筑台阶; 砍冰阶 | |||
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step cutting : 5 phrases in 4 subjects |
| Economy | 1 |
| Metallurgy | 2 |
| Mountaineering | 1 |
| Technology | 1 |
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