天懸地隔

see 天差地遠|天差地远[tian1 cha1 di4 yuan3]

day / sky / heaven

to hang or suspend / to worry / public announcement / unresolved / baseless / without foundation

-ly / structural particle: used before a verb or adjective, linking it to preceding modifying adverbial adjunct

earth / ground / field / place / land / CL:片[pian4]

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