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| English | Russian |
| competent bed | пласт, способный выдерживать нагрузку (refers to bed which maintains its thickness when subjected to stress even though it undergoes bending: as opposed to incompetent beds, which flow and thus become thicker and thinner at certain points) |
| competent refractor | выдержанный преломляющий горизонт |
| competent sandstone | крепкий песчаник |