“harmless-depth theory”的概念、定义、翻译、参考文献-科学参考

单词	harmless-depth theory
释义	harmless-depth theory [`härm·lǝs ¦depth ´thē·ǝ·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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