隔行如隔山

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

to separate / to partition / to stand or lie between / at a distance from / after or at an interval of

to interlace / to interleave (computing)

row / line / commercial firm / line of business / profession / to rank (first, second etc) among one's siblings (by age) / (in data tables) row / (Tw) column

to walk / to go / to travel / a visit / temporary / makeshift / current / in circulation / to do / to perform / capable / competent / effective / all right / OK! / will do / behavior / conduct / Taiwan pr. [xing4] for the behavior-conduct sense

as / as if / such as

half-sibling relationship / brothers with different mother / step-

mountain / hill / anything that resembles a mountain / CL:座[zuo4] / bundled straw in which silkworms spin cocoons / gable