同步數位階層 Save Sign in to save words Simplified: 同步数位阶层 tóngbùshùwèijiēcéng ㄊㄨㄥˊ ㄅㄨˋ ㄕㄨˋ ㄨㄟˋ ㄐㄧㄝ ㄘㄥˊ synchronous digital hierarchy SDH Character by character 同(tóng)like 步(bù)surname Bu 數(shù)number 位(wèi)position 階(jiē)rank or step 層(céng)pile on top of one another A Chinese word or character, or English Search Sources CC-CEDICT, CC BY-SA 4.0 pinyinjs, Apache-2.0