pdb (peedee belemnite) standard

英 [pdb (peedee belemnite) standard]
美 [pdb (peedee belemnite) standard]

中文释义

芝加哥箭石标准

单词分析

单词结构：

pdb (peedee belemnite) standard

字母数：31

记忆提示

🎯 重点记忆：

  • 单词拼写：pdb (peedee belemnite) standard
  • 核心含义：芝加哥箭石标准

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更新时间：2026-02-09 03:48:45