upstream boundary

英 [upstream boundary]
美 [upstream boundary]

中文释义

上游闭塞界限

单词分析

单词结构：

upstream boundary

字母数：17

记忆提示

🎯 重点记忆：

  • 单词拼写：upstream boundary
  • 核心含义：上游闭塞界限

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更新时间：2026-03-13 21:31:05