Last Updated
：2025/11/25
black coal
Sense（1）
Sense（2）
（ plural ）
Quizzes for review
high-quality coal / (nontechnical) coal
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black coal
The export company insisted on shipping only black coal, prized for its high calorific value.
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The export company insisted on shipping only black coal, prized for its high calorific value.
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