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permissive block signal
permissive block signal
英
[permissive block signal]
美
[permissive block signal]
中文释义
权宜闭塞号志(机)
单词分析
单词结构:
permissive block signal
字母数:23
记忆提示
🎯 重点记忆:
单词拼写:permissive block signal
核心含义:权宜闭塞号志(机)
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更新时间:2026-02-02 23:34:38