英汉词典

1. 预先；事先；提前
    If you do something beforehand, you do it earlier than a particular event.

    e.g. How could she tell beforehand that I was going to go out?...
           她怎么会事先知道我要出去？
    e.g. 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。