coal measures
柯林斯词典
1. N-PLURAL a series of coal-bearing rocks formed in the upper Carboniferous period; the uppermost series of the Carboniferous system 在上石炭紀期形成的煤系; 石炭紀躰系中最重要的系列 (習語the Coal Measures)
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1. N-PLURAL a series of coal-bearing rocks formed in the upper Carboniferous period; the uppermost series of the Carboniferous system 在上石炭紀期形成的煤系; 石炭紀躰系中最重要的系列 (習語the Coal Measures)