“first appearance datum”的概念、定义、翻译、参考文献-科学参考

单词	first appearance datum
释义	first appearance datum Encyclopedia 理学生物地层带释 first appearance datum首现点某一化石分类单元在地层中出现的第一个层位（薄层）。是生物面的一种。又称首现基准面。
随便看	natural environment space design natural epidemic focus natural epimorphism natural equation natural equivalence natural erosion natural exponent natural extension natural fade document natural family planning natural fermentation natural fertility natural fiber natural fiber reinforcements natural field electrical methods natural filter natural filtration natural-flavoring natural flowing production natural fluid flows natural focus natural forcing natural forest natural forest conservation program Natural Forest Protection Project

科学参考收录了854744条科技类词条，基本涵盖了常见科技类参考文献及英语词汇的翻译，是科学学习和研究的有利工具。