“bone chert”的概念、定义、翻译、参考文献-科学参考

单词	bone chert
释义	bone chert [`bōn ´chǝrt] ^PETROLOGY A weathered residual chert that appears chalky and porous with a white color but may be stained red or other colors.
随便看	sighting shot sighting station sighting system sighting tube sight leaf sight reduction sight-reduction tables sight rod sight tracking line sight unit sigma sigma algebra sigma bond sigma field sigma finite sigma function sigma hyperon sigma-minus hyperonic atom sigma phase sigma pile sigma ring sigmaspire sigma-T sigmatron sigmatropic shift

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