“事先”的拼音为：shì xiān...

“事先”的英语可以翻译为：in advance，beforehand，prior ...

“事先”的近义词/同义词：事前。...

“事先”的反义词：当时, 事后。...

她怎么会事先知道我要出去？How could she tell beforehand that I was going to go out?这可不是头脑一热作出的决定。我们事先仔细地讨论过。It wasn't a spur-of-the-moment decision. We discussed it in detail beforehand.我临走时特地事先把办公桌清理了一下。I took the precaution of...