“bad top”的概念、定义、翻译、参考文献-科学参考

单词	bad top
释义	bad top [`bad ´täp] ^{MINING ENGINEERING} A weak roof in a coal mine; sometimes develops following a blast.
随便看	cryotron cryotronics cryoturbation Cryphaeaceae crypt cryptanalysis cryptand cryptic behavior cryptic coloration Cryptobiidae cryptobiosis cryptobiotic Cryptobranchidae Cryptobranchoidea Cryptocerata Cryptochaetidae cryptochannel cryptoclastic cryptoclimate cryptoclimatology Cryptococcaceae Cryptococcales cryptococcal meningitis cryptococcosis Cryptococcus

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