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| закрытое дело; исчерпанный вопрос; тайна за семью печатями (a subject or problem that someone does not know about or understand. Например: Mathematics has always been a closed book to me. teterevaann); вещь непостижимая (a subject or person about which one knows nothing. accounting has always been a closed book to me. NOED Alexander Demidov); что-то неизвестное; что-то непонятное | |||
| книга за семью печатями | |||
| закрытая бухгалтерская книга | |||
| труднопонимаемое (thing that cannot be easily understood Interex); непонятное (Interex); загадочное (Interex) | |||
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без использования справочного материала (adj. referring to exams in which external resources such as glossaries, study notes, calculators, etc are prohibited At the final level folks had to write a closed-book exam. The researchers seemed impressed that practice retrieving facts worked better than making concept maps with the text in front of them at preparing students for a closed-book test even when the test itself involved making concept maps. I am sorry to inform you that there will be a closed-book final examination at the end of the course.  wordnik.com Alexander Demidov) | |||
| closed book: 7 phrases in 4 subjects |
| Agriculture | 1 |
| General | 1 |
| Makarov | 2 |
| Proverb | 3 |