And I had the good fortune to secure myself immunity in exchange for my cooperation.而我运气好到可以用合作来换取我的豁免权

in exchange for交换； 调换

Please let me have a marketable lot in exchange for them.

请允许我们收到能出售的货物并将原货寄回。

I gave Mary an apple in exchange for my favorite banana.

我送给玛丽一个苹果换我最喜欢吃的香蕉。

and I passed it off on him.然后再冒充真品卖给他

pass on传递；传授

Seek him out and pass on the news.

把他找出来并且把消息传达给他。

Let's pass on to the next item on the agenda.

咱们进行议事日程的下一个项目吧。

Why would Conrad hold on to somethingthat he knows has little value whatsoever?康拉德怎么会抓住一件无论怎么看都毫无价值的东西不放呢

hold on 抓住；继续；坚持；忍受

He held on to the rock to stop himself slipping.

他紧紧抓住岩石以免自己往下滑。

These nuts and bolts hold the wheels on.

这些螺帽和螺栓把轮子固定住了。