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| man-hole opening | |||
| access port; manhole opening | |||
| 人 孔口: 57 phrases in 10 subjects |
| Agriculture | 1 |
| Architecture | 4 |
| Aviation | 1 |
| Chemistry | 2 |
| Communications | 1 |
| Explosives and Explosive Ordnance Disposal | 1 |
| General | 1 |
| Metallurgy | 42 |
| Refrigeration | 1 |
| Technology | 3 |
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