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balance hole | |||
balancing holds | |||
balanced hole; equalizing port | |||
balancing hole; equalizing hole |
平衡孔: 14 phrases in 6 subjects |
Cosmetics and cosmetology | 1 |
Electric machinery | 1 |
Explosives and Explosive Ordnance Disposal | 3 |
Geophysics | 2 |
Hydroelectric power stations | 1 |
Oil / petroleum | 6 |