bottom-hole safety valve

英 [bottom-hole safety valve]
美 [bottom-hole safety valve]

中文释义

井底安全阀

单词分析

单词结构：

bottom-hole safety valve

字母数：24

记忆提示

🎯 重点记忆：

  • 单词拼写：bottom-hole safety valve
  • 核心含义：井底安全阀

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更新时间：2026-01-21 04:16:08