secondary standard source

英 [secondary standard source]
美 [secondary standard source]

中文释义

次级标准源

单词分析

单词结构：

secondary standard source

字母数：25

记忆提示

🎯 重点记忆：

  • 单词拼写：secondary standard source
  • 核心含义：次级标准源

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更新时间：2026-01-23 17:40:11