一蹴而就----make it at one/a stroke

例句：
A:He's always dreaming of success overnight.
他老是梦想一夜成功。
B:Blockhead! He should know (that)it's impossible to make it at one stroke.
笨蛋！他应该知道一蹴而就是不可能的。

同义词:
succeed overnight
take something all in one stride