also before-hand, early 13c., from before + hand, which here is of uncertain signification, unless the original notion is payment in advance or something done before another's hand does it. Hyphenated from 18c., one word from 19c.
权威例句
1. How could she tell beforehand that I was going to go out?
她怎么会事先知道我要出去?
2. Saunas can be hazardous if misused. Avoid a big meal beforehand.
洗桑拿浴如果方法不当会有危险,浴前切忌饱食。
3. It wasn't a spur-of-the-moment decision. We discussed it in detail beforehand.
这可不是头脑一热作出的决定。我们事先仔细地讨论过。
4. Rehearse and role-play the interview with a friend beforehand.