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| яма для наблюдения | |||
| отверстие наблюдения | |||
| обзорный люк | |||
| наблюдаемая скважина; смотровое окошко; смотровой фонарь | |||
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观测 孔 : 8 phrases in 3 subjects |
| General | 1 |
| Oil and gas | 1 |
| Technology | 6 |
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