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backward busy signal
backward busy signal
英
[backward busy signal]
美
[backward busy signal]
中文释义
回程占线信号
单词分析
单词结构:
backward busy signal
字母数:20
记忆提示
🎯 重点记忆:
单词拼写:backward busy signal
核心含义:回程占线信号
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更新时间:2026-02-05 21:16:38