单词	black shale
释义	black shale noun : a dark form of shale characterized by a relatively high degree of carboniferous compounds The studies of others indicate that major phosphorite deposits are often associated with black shales and accumulated during only a few epochs of geologic history. D. Z. Pipe et al., Science, 4 Apr. 1975 Word History First Known Use 1730, in the meaning defined above
随便看	draftiliest draftily draftiness draftinesses drafting drafting board drafting machine drafting race drafting table drafting yard draftings draftman draftmanship draftmen drafts draftsman draftsmanly draftsmanship draftsmanships draftsmen draftsperson draftspersons draftswomen drafty drag

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