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difficult (oil resources whose production is problematic; запасы); problematic (запасы) | |||
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difficult (igisheva); hard-to-recover (igisheva) |
трудноизвлекаемые: 23 phrases in 7 subjects |
General | 1 |
Oil / petroleum | 3 |
Oil and gas | 10 |
Oil and gas technology | 1 |
Oilfields | 4 |
Sakhalin | 2 |
Tengiz | 2 |