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| protection tube | |||
| guard tube | |||
| protecting tube | |||
| protective pipe | |||
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防 护管 : 22 phrases in 10 subjects |
| Automobiles | 1 |
| Drilling | 2 |
| Explosives and Explosive Ordnance Disposal | 1 |
| Geology | 1 |
| Metallurgy | 1 |
| Oil / petroleum | 3 |
| Rail transport | 1 |
| Space | 1 |
| Technology | 10 |
| Telecommunications | 1 |
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