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| 中心掏槽; 中央掏槽在开挖面中央，钻凿一组较密、深度比开挖面的其他部位炮孔略深的炮孔，尽可能地装填较多炸药,并先于其他炮孔起爆,爆破这组炮孔称为中心掏槽 | |||
| 中心开挖; 中央陶槽; 中心掏槽锥形掏槽 | |||
| center cut: 4 phrases in 3 subjects |
| Metallurgy | 1 |
| Technology | 2 |
| Textile industry | 1 |
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