bargain on

基本解释

Seeing students' book bargain on a campus sidewalk is nothing new, it's true.
学生们在校内的人行道上买卖旧书，这已不是什么新鲜事儿了。
The biggest obstacles to any grand bargain on Iraq may well be practical rather than ideological.
之所以在伊拉克问题上如此讨价还价，是因为目前最大困难不是主导政府意识形态的问题，而是是否有可操作性的问题。
Reasonable people can disagree as to whether the bargain is worth it, but it is a bargain on the margins.
理性的人可以对这笔交易是否值得产生质疑，但这笔交易是走在讨价还价的边缘。

Secretary Gates said there are some "exaggerated concerns" in the region that a so-called "grand bargain" with Iran will be negotiated in secret and then sprung on the region without warning.
Some analysts have suggested that the Obama administration move to dramatically change the nature of the U.S.-Iran relationship through a so-called "grand bargain" by,for example,making some concessions on regional security issues in return for an end to Iran's nuclear program and its interference in Iraq and Afghanistan.

Just think of how many little ideas it will take to hammer out each point of a grand bargain on economic policy.
FORBES: Racking Up Ideas, on the Cliff
The prime example is the so-called Super Committee charged with arriving at a grand bargain on the long-term budget, taxes and spending.
FORBES: Can Politicians be Forced to Rise Above Politics?

If you have not bargained for or bargained on something that happens, you did not expect it to happen and so feel surprised or worried by it.