英语词汇“relief hole”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	relief hole
释义	relief hole relief hole [ri′lēf ‚hōl] (engineering) Any of the holes fired after the cut holes and before the lifter holes in breaking ground for tunneling or shaft sinking.
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