a lot(/world) of difference; as far apart as heaven and earth; be vastly different; make all the difference in the world; poles (/worlds) apart ? 歐陽反正是跑不掉了，可這一出一進(jìn)對我是～?。?宗福先《于無聲處》45) After all Ouyang can’t escape. But to let him go or have him arrested makes a lot of difference to me. ? 它的軍隊(duì)和紅軍比較起來真有～。(《毛澤東選集》173) There is a world of difference between the Kuomintang army and the Red Army.
天壤之別
as far apart as heaven and earth;worlds or poles apart;world of difference
天壤之別tiān rǎnɡ zhī bié
天壤：天上和地下。比喻差別非常之大。worlds apart, vast difference, make all the difference in the world, a whale of a difference