汉英词典
Chinese-English Dictionary
MEANING OF 同步数位阶层
tóng bù shù wèi jiē céng
同步数位阶层 (同步數位階層)
synchronous digital hierarchy / SDH
同 tóng 步 bù 数 (數) shù/shǔ/shuò 位 wèi 阶 (階) jiē 层 (層) céng
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