prior

You do not need any prior knowledge of the subject..你无需事先具备该方面的知识。

Changes may not be made without the prior approval of the council..未经委员会事先同意，不得作出改变。

Vegetarian meals are provided by prior agreement..经事先协商可提供素食。

Some prior experience with the software is needed..要求事先熟悉这个软件。

prior notice,事先通知；预先通报

prior art,先前技术

prior approval,事先批准；预先审批；事前批准；事前许可；预先核准

prior probability,先验概率，事前机率

prior period,前期；上期

prior condition,先决条件