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principal and subordinate clock system是什么意思
中文翻译子母钟
网络释义
1)principal and subordinate clock system,子母钟2)master and slave clock, primary and secondary clock,母钟和子钟3)wide area slave and master clock,大区域子母钟4)mother clock,母钟5)primary clock,母钟，主钟6)Primary master clock,一级母钟