ㄨㄣˊㄅㄨˋㄐㄧㄚㄉㄧㄢˇwénbùjiādiǎn

文不加点
  1. 文章不須刪改表示記號)​。形容文思敏捷下筆成章 總是下筆淋漓文不加點」。

to write a flawless essay in one go (idiom)​, to be quick-witted and skilled at writing compositions