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| air-filled hole | |||
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充 气 孔 : 14 phrases in 8 subjects |
| Agriculture | 1 |
| Continuous casting | 1 |
| Desert science | 1 |
| Earth sciences | 1 |
| Engineering geology | 2 |
| Explosives and Explosive Ordnance Disposal | 1 |
| Oil / petroleum | 2 |
| Technology | 5 |
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