quid pro quo

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If the search market were competitive, then normal commercial negotiations would establish some sort of quid pro quo for the exchange.
如果搜索市场是一个竞争性市场，那么，常规的商业谈判将会确立某种形式的交换补偿。
The smart thing for Obama will be to cast his decision on missile defense within a working format of "resetting" ties with Russia rather than as a move that deserves a quid pro quo over Iran.
将放弃导弹防御系统的决定置于“重启”与俄罗斯的关系这一工作方式内，而不是将此举视作在伊朗问题上的交换条件，将是奥巴马的聪明做法。
“Clean, ” in this context, means a taxpayer-financed bailout with no strings attached — no quid pro quo on the part of those being bailed out.
“干净”在这个语境中意味着纳税人无条件地为紧急救市埋单——他们为救市付出的那部分没有任何补偿。

He would gladly have sacrificed them in order to keep the much more virtuous and pure Lycidas -a gruesome proposal, but it's a gruesome proposal that suggests a primitive desire for a quid pro quo.
他很乐意牺牲了他们,来维持更为纯洁纯粹的,这是一首令人毛骨悚然的提议,暗示着一种最原始的复仇的欲望。
耶鲁公开课 - 弥尔顿课程节选

However, a Justice Department official said the indictment does not allege any quid pro quo.
NPR: Justice Department Indicts Alaska Sen. Stevens
Don't expect a smoking pen in the form of a blatant quid pro quo.
FORBES: Bechtel Tries To Put Iraq Back Together

A quid pro quo is a gift or advantage that is given to someone in return for something that they have done.