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| |||
| killing well; outside sealing | |||
| capping; plugging a well | |||
| outside sealing of well | |||
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封井 : 116 phrases in 11 subjects |
| Drilling | 22 |
| Earth sciences | 1 |
| Electronics | 1 |
| Engineering geology | 4 |
| General | 2 |
| Hydroelectric power stations | 2 |
| Mining | 2 |
| Navigation | 1 |
| Oil / petroleum | 48 |
| Pharmacology | 1 |
| Technology | 32 |
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