英语词汇“primary drilling”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	primary drilling
释义	primary drilling primary drilling [′prī‚mer·ē ′dril·iŋ] (engineering) The process of drilling holes in a solid rock ledge in preparation for a blast by means of which the rock is thrown down.
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