The central bank also announced that it would purchase up to $750 billion of additional mortgage-backed securities, which lost value with the collapse of the U.S.housing market.

VOA: standard.2009.03.18

And then at top right there's this longer sentence to purchase new Charlie ticket, value tickets and passes, press here.

然后，右上边没有说明,怎样购买Charlie票，票值是多少,按这个按钮。

哈佛公开课 - 计算机科学课程节选

I bought a number of two-period bonds such that the value of my purchase exactly equals the proceeds that I get from shorting the one period bond, so I've made a zero wealth transaction.

我买入了一定数量的两年期债券,其成本刚好等于我卖空,一单位一年期债券获得的资金,我做的是零成本交易

耶鲁公开课 - 金融市场课程节选

So, I did some reading quickly and she looked at the screen for a moment and then I suggested we hit the top right button to purchase new Charlie Ticket, whatever that is, value tickets and passes.

所以，我快速阅读了一下，她看着屏幕一段时间,然后我建议点击右上边的按钮,来买一张新的Charlie票，不管怎样，那是一张有值票，可以通过。

哈佛公开课 - 计算机科学课程节选