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| 岩石平巷; 岩石工作面; 石巷 | |||
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| 硬头 (锡铁合金，锡精矿还原熔炼的一种副产品); 难熔的矿石 | |||
| 硬质巴比合金; 硬头 | |||
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hard heading : 12 phrases in 7 subjects |
| Architecture | 2 |
| Business | 1 |
| Drilling | 1 |
| Economy | 1 |
| Finances | 1 |
| Oil / petroleum | 1 |
| Technology | 5 |
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