单词	fossil ivory
释义	fossil ivory noun : ivory that has been buried long enough to become yellowish, variegated, sepia, or black in color see old bering sea Word History First Known Use 1728, in the meaning defined above
随便看	cost-effective cost-effectiveness cost-efficient cost-of-liv cost-of-living index cost-plus cost-push costa Costa Brava Costa Cabral Costa del Sol Costa Mesa Costa Rica costa rican costae costal costal respiration costal-nerved costaler costalest costalgiae costalgias costaller costallest costally

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