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From: MDBG CC-CEDICT Chinese-English Dictionary 漢英字典

 同步數位階層 [ㄊㄨㄥˊ ㄅㄨˋ ㄕㄨˋ ㄨㄟˋ ㄐㄧㄝ ㄘㄥˊ; tong2 bu4 shu4 wei4 jie1 ceng2]
 synchronous digital hierarchy
 SDH
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