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следование с промежутком во времени |
timed interval : 19 phrases in 11 subjects |
Astronautics | 2 |
Aviation | 1 |
Construction | 1 |
Economics | 2 |
Microelectronics | 1 |
Military | 2 |
Nautical | 2 |
Oil / petroleum | 4 |
Rail transport | 2 |
Seismology | 1 |
Telecommunications | 1 |