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作为一个条件，我们应该要求他们参加一个特殊的项目：任何光顾了其中两家企业的顾客都将在第三家企业获得大幅折扣。

As a condition, we should require them to participate in a special program: Any customer who patronizes two of the businesses will receive a substantial discount at the third.

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他们给我们提供资金有一个条件，即我们在六个月以内偿还。

They will give us the money on one condition —that we pay it back within six months.

《牛津词典》

But there's a catch, the catch is, that that means you have to sign that legal release form.

但是这会有个条件,你们都要签署授权书

耶鲁公开课 - 博弈论课程节选

STUDENT: Just a quick question on some of the constraints, like isothermal, isobaric, isovolumetric expansion.

学生：我有个关于,等温，等压，等容等约束条件的小问题。

麻省理工公开课 - 热力学与动力学课程节选

To make this a first order condition, I'm going to say "at the best response," put a hat over the 1.

为了达到一阶条件,我说在最佳对策下,在S1上写个帽

耶鲁公开课 - 博弈论课程节选