Taivo A Taiwan Mandarin dictionary

隔行如隔山

géhángrúgéshān

ㄍㄜˊ ㄏㄤˊ ㄖㄨˊ ㄍㄜˊ ㄕㄢ

  1. 1different trades, worlds apart (idiom); to sb outside the profession, it is a closed book

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