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| circulation flush | |||
| 循环冲洗: 39 phrases in 7 subjects |
| Aviation | 1 |
| Desert science | 1 |
| Drilling | 2 |
| Engineering geology | 3 |
| Explosives and Explosive Ordnance Disposal | 6 |
| Oil / petroleum | 8 |
| Technology | 18 |
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