同步數位階層

tóng bù shù wèi jiē céng

n. synchronous digital hierarchy

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tong2 bu4 shu4 wei4 jie1 ceng2

synchronous digital hierarchy, SDH

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同步數位階層|同步数位阶层 [tóng bù shù wèi jiē céng] ► synchronous digital hierarchy ► SDH