No. 17,687 in Russian
угольной
"Угольной" means "coal" or "carbon-related" (adjectival form).
In a sentence
Он посмотрел на угольной графит карандаш.
He looked at the coal graphite pencil.
The usage of "угольной" here refers to coal-derived, in describing the pencil material.
Фабрика производит материалы угольной промышленности.
The factory produces materials for the coal industry.
The term "угольной" is an adjective related to the coal industry.
На угольной шахте работало много людей.
Many people worked at the coal mine.
The adjective "угольной" modifies "шахте" to indicate it is a coal mine.
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