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| reliever | |||
| dewatering orifice | |||
| drainage borehole; drain hole; escape hole; outlet hole; relief hole | |||
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放水孔 : 16 phrases in 6 subjects |
| Automobiles | 2 |
| Ecology | 1 |
| Electronics | 2 |
| Explosives and Explosive Ordnance Disposal | 1 |
| Hydroelectric power stations | 3 |
| Technology | 7 |
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