A study in the United States found that eighty-four percent of undergraduates last year had at least one credit card.

VOA: special.2009.05.28

But in society today, and we'll talk a bit about security topics -- and such throughout the course, for cryptography -- for encrypting things like your credit card information and bank accounts -- you don't use 32 bits, you don't use 64 bits, you generally use 1024 bits, 4,048 bits.

但在当今的社会上，我们将讨论一点安全方面的知识,贯穿整个课程，密码学-,加密一些像信用卡信息,银行账号之类的东西--你不能用32位，你也不能用64位，你通常要使用1024位，4048位。

哈佛公开课 - 计算机科学课程节选

To get a credit card, they will need a parent or other adult over twenty-one to accept joint responsibility.

VOA: special.2009.05.28

Americans held nine hundred forty-six billion dollars in credit card debt at the end of March.

VOA: special.2009.05.22

The government says forty-five percent of college students have credit card debt.

VOA: special.2009.04.10

The president plans to talk about credit card reform on Thursday (5/14), when he hosts a question-and-answer forum in the Southwestern city of Albuquerque,New Mexico.

VOA: standard.2009.05.09