但是，这不能一蹴而就。

But that cannot be achieved overnight.

youdao

他知道，改造社会不能一蹴而就。

He knew that he could not transform society by one bugle blast.

youdao

正如一口吃不成个胖子一样，成功不能一蹴而就。

Just as no one grows fat at one sitting, no success can be attained with one single effort.

youdao

You can imagine that this can only happen gradually; none of this happens overnight.

你可以想象得出,这种变革,只能缓慢的进行,并不能一蹴而就

耶鲁公开课 - 古希腊历史简介课程节选