隔山

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

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

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

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