| 单词 | coal ball |
| 释义 | coal ballnouna spherical mass of mineral and plant material embedded in coal beds, ranging in size from that of a pea to that of a boulder. Origin of coal ballFirst recorded in 1735–45 Words nearby coal ballcoagulum, Coahuila, coak, coal, coala, coal ball, coalbin, coal car, coal cutter, coaler, coalesce Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020 |
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