英语词汇“harmless-depth theory”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	harmless-depth theory
释义	harmless-depth theory harmless-depth theory [′härm·ləs ¦depth ‚thē·ə·rē] (mining engineering) Formerly, the hypothesis that there was a certain depth below which mining could be carried on without risk of damage to the surface.
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