beforehand [bɪˈfɔ:hænd]

以下由轻松背单词网站提供

adj.事先，预先，提前地，超前地

earlier (than a particular time )

If I'd known this beforehand, I would not have gone back. 早知如此，我就不回去了。
They proposed to make arrangement beforehand. 他们提议事先做好安排。