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в четырёх стенах (A disadvantage of team teaching, of course, has been that it required the teacher, normally an individualistic person accustomed to complete authority within the four walls of his classroom, to sink his authority and his subject speciality within a group.  english-corpora.org); тайно | |||
| конфиденциально; не должно выходить за пределы этой комнаты; секретно | |||
| within four walls: 15 phrases in 2 subjects |
| General | 12 |
| Makarov | 3 |