美国银行授予他们无担保信用证。
The Bank of America grants them unsecured letters of credit.
这就是负有臭名的无担保信用违约互换。
比方说,美国国债的风险低于无担保信用卡贷款额度(我们希望如此)。
For instance, an investment in U.S. Treasuries carries lower risk (we hope) than an unsecured credit card line.
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