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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因为您现有的信用额度不够，如果您需要把费用记入您的房账中，您就得去我们收款的柜台，再次刷您的信用卡做担保，或者支付押金。

As your current credit is not enough, if you wish to charge to your room bill, you'll have to go to the cashier counter to take a print of your credit card again, or you may pay more deposit.

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