英语词汇“double headings”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典

单词	double headings
释义	double headings double headings [¦dəb·əl ′hed·iŋz] (mining engineering) A pair of coal headings driven parallel to each other and positioned side by side about 10-20 yards (9-18 meters) apart.
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