They have a prior claim to the property.

他们有权优先获得该处房产。

《牛津词典》

I had to refuse because of a prior engagement.

我因为已经有预约只好拒绝了。

《牛津词典》

She will be unable to attend because of a prior engagement.

因事先有别的安排，她将不能出席。

《牛津词典》

"Prior to export, we are subject to a series of tests."

VOA: standard.2010.05.27

God has a bigger property right in us, a prior property right.

上帝更有权拥有我们，是种至高无上的权利。

耶鲁公开课 - 公正课程节选

but you have a prior engagement and you really must be going, you can say,

但是你已有约在先，你真的必须走了，你可以说，

I wish 课堂 - SpeakingMax英语口语达人

They would be a prior step, taken to humanize one another in our imaginations.

WSJ: Alain de Botton on Religion for Everyone

Bacanovic told him that the ImClone sale was pursuant to a prior agreement.

FORBES: Martha Trial: 'Everyone Is Telling The Same Story'

Candidates from a different industry landed 13.6% of such positions in 2012, a prior ExecuNet poll found.

WSJ: How to Switch Careers, Companies and Roles