单词	acid-fast
释义	acid-fast adjective ac·​id-fast ˈa-səd-ˌfast  : not easily decolorized by acids Word History First Known Use 1903, in the meaning defined above Medical Definition acid-fast adjective ˈas-əd-ˌfast  : not easily decolorized by acids (as when stained) —used especially of bacteria and tissues
随便看	umbonations umbone umbones umbonial umbonic umbonulate umbos umbra umbra tree Umbracula Umbraculidae umbraculums umbrae umbrage umbraged umbrageous umbrageously umbrageousness umbrageousnesses umbrages umbraging umbral umbral symbol umbras umbrated

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