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| Subject | English | Russian |
| geol. | a period during which | период, в течение которого (An unconformity represents a period during which deposition did not occur or erosion removed rock that had been deposited ArcticFox) |
| Makarov. | period during which a body of water in an area is completely frozen over | период образования на поверхности реки или водоёма неподвижного льда |
| media. | period during which a call is active | срок действия заказа на разговор |