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| 火口，燃烧层穿孔; 火口; 燃烧层穿孔 | |||
| 坩埚炉; 坩埚孔 | |||
| 点火孔 | |||
| 炉口; 火孔 | |||
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| 钢坩埚炉 | |||
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fire -hole : 7 phrases in 4 subjects |
| Drilling | 1 |
| Shipbuilding | 1 |
| Space | 1 |
| Technology | 4 |
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