最終更新日：2024/07/29

A nodule of plant material permeated with minerals found mostly in bituminous and anthracite coal seams

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coal ball

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元となった辞書の項目

coal ball

noun

A nodule of plant material permeated with minerals found mostly in bituminous and anthracite coal seams

The coal ball was discovered during the excavation.

意味（1）

A nodule of plant material permeated with minerals found mostly in bituminous and anthracite coal seams