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。
adj. [数]优先的；在先的，在前的
preferred、
underlying
adv. 在前，居先
before、
antecedently
n. priority
vi. prioritize
vt. prioritize